diff --git a/README.md b/README.md
index 606a94d..b1b0a13 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,7 @@
 - pytest / FastAPI TestClient
 - Docker / Docker Compose
 
-项目目标是小而稳、容易继续扩展。目前已经支持固定三层的数据结构、基础 CRUD，以及单图上传能力，但仍然没有加入搜索、OCR、AI 识别或其他扩展功能。
+项目目标是小而稳、容易继续扩展。目前已经支持固定三层的数据结构、基础 CRUD、单图上传能力和全局搜索，但仍然没有加入 OCR、AI 识别或其他扩展功能。
 
 ## 当前数据模型
 
@@ -44,6 +44,7 @@ Box
 - Item 新建、详情、编辑、删除
 - SubItem 新建、编辑、删除
 - Box / Item / SubItem 单张图片上传、替换、删除、展示
+- Box / Item / SubItem 全局搜索
 - `/` 重定向到 `/boxes`
 - Jinja2 模板渲染
 - 静态文件挂载
@@ -92,6 +93,33 @@ Box
 - `/items/{id}/image`
 - `/subitems/{id}/image`
 
+## 全局搜索
+
+当前已经支持一个轻量的全局搜索页：
+
+- 路由：`/search`
+- 使用 query parameter，例如：`/search?q=电源线`
+
+搜索范围包括：
+
+- `Box.name`
+- `Box.note`
+- `Item.name`
+- `Item.note`
+- `SubItem.name`
+- `SubItem.note`
+
+当前使用 SQLite 上的简单模糊匹配完成搜索，不引入外部搜索引擎或复杂全文系统。
+
+搜索结果会尽量帮助你快速定位：
+
+- 显示对象类型：`Box / Item / SubItem`
+- 显示名称和备注
+- 显示归属路径
+- 对 `Item` 展示所属 `Box`
+- 对 `SubItem` 展示所属 `Item` 和 `Box`
+- 如果对象已有图片，会显示一个小缩略图
+
 ## 当前未实现
 
 这一阶段仍然没有实现以下内容：
@@ -232,5 +260,6 @@ python -m pytest
 - 非容器 Item 不能创建 SubItem
 - Box / Item 删除后的级联删除
 - 图片上传、转换为 JPEG、缩放、读取、替换、删除
+- 全局搜索 name / note，并展示对象类型与归属路径
 - 无图片访问和非法图片上传等错误路径
 - 关键 POST 请求后的重定向行为
diff --git a/app/main.py b/app/main.py
index 054940b..ce6cd0f 100644
--- a/app/main.py
+++ b/app/main.py
@@ -4,6 +4,7 @@ from fastapi import Depends, FastAPI, File, Form, HTTPException, Request, Upload
 from fastapi.responses import RedirectResponse, Response
 from fastapi.staticfiles import StaticFiles
 from fastapi.templating import Jinja2Templates
+from sqlalchemy import func, or_
 from sqlalchemy.orm import Session
 
 from app.db import get_db, init_db
@@ -81,6 +82,100 @@ def _image_response_or_404(target) -> Response:
     return Response(content=target.image_blob, media_type=target.image_mime_type)
 
 
+def _build_search_results(db: Session, query: str) -> list[dict]:
+    keyword = f"%{query.lower()}%"
+    results: list[dict] = []
+
+    box_matches = (
+        db.query(Box)
+        .filter(
+            or_(
+                func.lower(Box.name).like(keyword),
+                func.lower(func.coalesce(Box.note, "")).like(keyword),
+            )
+        )
+        .order_by(Box.id.desc())
+        .all()
+    )
+    for box in box_matches:
+        results.append(
+            {
+                "type": "Box",
+                "name": box.name,
+                "note": box.note,
+                "detail_url": f"/boxes/{box.id}",
+                "detail_label": "查看箱子",
+                "secondary_url": None,
+                "secondary_label": None,
+                "path": "顶层箱子",
+                "is_container": None,
+                "image_url": f"/boxes/{box.id}/image" if box.image_blob else None,
+            }
+        )
+
+    item_matches = (
+        db.query(Item)
+        .join(Item.box)
+        .filter(
+            or_(
+                func.lower(Item.name).like(keyword),
+                func.lower(func.coalesce(Item.note, "")).like(keyword),
+            )
+        )
+        .order_by(Item.id.desc())
+        .all()
+    )
+    for item in item_matches:
+        results.append(
+            {
+                "type": "Item",
+                "name": item.name,
+                "note": item.note,
+                "detail_url": f"/items/{item.id}",
+                "detail_label": "查看物品",
+                "secondary_url": f"/boxes/{item.box.id}",
+                "secondary_label": "查看所属箱子",
+                "path": f"位于箱子：{item.box.name}",
+                "is_container": item.is_container,
+                "image_url": f"/items/{item.id}/image" if item.image_blob else None,
+            }
+        )
+
+    subitem_matches = (
+        db.query(SubItem)
+        .join(SubItem.parent_item)
+        .join(Item.box)
+        .filter(
+            or_(
+                func.lower(SubItem.name).like(keyword),
+                func.lower(func.coalesce(SubItem.note, "")).like(keyword),
+            )
+        )
+        .order_by(SubItem.id.desc())
+        .all()
+    )
+    for subitem in subitem_matches:
+        results.append(
+            {
+                "type": "SubItem",
+                "name": subitem.name,
+                "note": subitem.note,
+                "detail_url": f"/items/{subitem.parent_item.id}",
+                "detail_label": "查看所属物品",
+                "secondary_url": f"/boxes/{subitem.parent_item.box.id}",
+                "secondary_label": "查看所属箱子",
+                "path": (
+                    f"位于物品：{subitem.parent_item.name} / "
+                    f"箱子：{subitem.parent_item.box.name}"
+                ),
+                "is_container": None,
+                "image_url": f"/subitems/{subitem.id}/image" if subitem.image_blob else None,
+            }
+        )
+
+    return results
+
+
 def create_app() -> FastAPI:
     @asynccontextmanager
     async def lifespan(app: FastAPI):
@@ -94,6 +189,25 @@ def create_app() -> FastAPI:
     def root() -> RedirectResponse:
         return RedirectResponse(url="/boxes", status_code=status.HTTP_302_FOUND)
 
+    @app.get("/search")
+    def search_page(
+        request: Request,
+        q: str | None = None,
+        db: Session = Depends(get_db),
+    ):
+        query = (q or "").strip()
+        results = _build_search_results(db, query) if query else []
+        return templates.TemplateResponse(
+            request=request,
+            name="search/index.html",
+            context={
+                "page_title": "搜索",
+                "query": query,
+                "results": results,
+                "searched": bool(query),
+            },
+        )
+
     @app.get("/boxes")
     def list_boxes(request: Request, db: Session = Depends(get_db)):
         boxes = db.query(Box).order_by(Box.id.desc()).all()
diff --git a/app/static/style.css b/app/static/style.css
index 24c44ec..a36726d 100644
--- a/app/static/style.css
+++ b/app/static/style.css
@@ -69,6 +69,8 @@ button:hover {
 
 .top-nav {
     margin-bottom: 24px;
+    display: flex;
+    gap: 16px;
 }
 
 .page-header,
@@ -92,6 +94,30 @@ button:hover {
     background: #fafafa;
 }
 
+.search-form {
+    display: flex;
+    gap: 12px;
+    align-items: center;
+    flex-wrap: wrap;
+}
+
+.search-form input {
+    flex: 1 1 320px;
+    min-width: 220px;
+    margin-top: 0;
+}
+
+.search-result {
+    display: flex;
+    gap: 16px;
+    align-items: flex-start;
+}
+
+.result-body {
+    flex: 1;
+    min-width: 0;
+}
+
 .detail-image {
     display: block;
     width: 100%;
diff --git a/app/templates/base.html b/app/templates/base.html
index 54f3130..6b4c150 100644
--- a/app/templates/base.html
+++ b/app/templates/base.html
@@ -10,6 +10,7 @@
     <main class="container">
         <nav class="top-nav">
             <a href="/boxes">箱子</a>
+            <a href="/search">搜索</a>
         </nav>
         {% block content %}{% endblock %}
     </main>
diff --git a/app/templates/boxes/show.html b/app/templates/boxes/show.html
index e974941..34b020f 100644
--- a/app/templates/boxes/show.html
+++ b/app/templates/boxes/show.html
@@ -8,6 +8,7 @@
     </div>
     <div class="actions">
         <a href="/boxes">返回箱子列表</a>
+        <a href="/search">去搜索</a>
         <a class="button" href="/boxes/{{ box.id }}/items/new">添加物品</a>
     </div>
 </div>
diff --git a/app/templates/items/show.html b/app/templates/items/show.html
index 78db883..4e09cfe 100644
--- a/app/templates/items/show.html
+++ b/app/templates/items/show.html
@@ -8,6 +8,7 @@
     </div>
     <div class="actions">
         <a href="/boxes/{{ item.box.id }}">返回箱子</a>
+        <a href="/search">去搜索</a>
         <a href="/items/{{ item.id }}/edit">编辑物品</a>
     </div>
 </div>
diff --git a/app/templates/search/index.html b/app/templates/search/index.html
new file mode 100644
index 0000000..c1c3beb
--- /dev/null
+++ b/app/templates/search/index.html
@@ -0,0 +1,62 @@
+{% extends "base.html" %}
+
+{% block content %}
+<div class="page-header">
+    <div>
+        <h1>全局搜索</h1>
+        <p class="muted">按名称或备注搜索箱子、物品和子物品，快速定位它们所在的位置。</p>
+    </div>
+</div>
+
+<section class="card">
+    <form method="get" action="/search" class="search-form">
+        <input
+            type="search"
+            name="q"
+            value="{{ query }}"
+            placeholder="例如：锅、电源线、冬衣、文件袋"
+        >
+        <button type="submit">搜索</button>
+    </form>
+</section>
+
+{% if searched %}
+    {% if results %}
+    <section class="stack">
+        <p class="muted">共找到 {{ results|length }} 条结果。</p>
+        {% for result in results %}
+        <article class="card search-result">
+            {% if result.image_url %}
+            <img src="{{ result.image_url }}" alt="{{ result.name }}" class="thumb-image">
+            {% endif %}
+            <div class="result-body">
+                <p class="meta">类型：{{ result.type }}</p>
+                <h2>{{ result.name }}</h2>
+                <p><strong>定位：</strong>{{ result.path }}</p>
+                {% if result.type == "Item" and result.is_container %}
+                <p><strong>容器：</strong>是</p>
+                {% endif %}
+                {% if result.note %}
+                <p><strong>备注：</strong>{{ result.note }}</p>
+                {% endif %}
+                <div class="actions">
+                    <a href="{{ result.detail_url }}">{{ result.detail_label }}</a>
+                    {% if result.secondary_url %}
+                    <a href="{{ result.secondary_url }}">{{ result.secondary_label }}</a>
+                    {% endif %}
+                </div>
+            </div>
+        </article>
+        {% endfor %}
+    </section>
+    {% else %}
+    <section class="card">
+        <p>没有找到匹配结果。</p>
+    </section>
+    {% endif %}
+{% else %}
+<section class="card">
+    <p>输入关键词后，可以跨 Box、Item、SubItem 进行搜索。</p>
+</section>
+{% endif %}
+{% endblock %}
diff --git a/tests/test_app.py b/tests/test_app.py
index 9ded456..e6065a1 100644
--- a/tests/test_app.py
+++ b/tests/test_app.py
@@ -562,3 +562,148 @@ def test_broken_image_processing_returns_400_and_keeps_image_fields_empty(client
     assert updated_box.image_mime_type is None
     assert updated_box.image_width is None
     assert updated_box.image_height is None
+
+
+def test_can_search_box_by_name(client, db_session):
+    box = Box(name="冬季衣物箱")
+    db_session.add(box)
+    db_session.commit()
+
+    response = client.get("/search?q=衣物")
+
+    assert response.status_code == 200
+    assert "冬季衣物箱" in response.text
+    assert "类型：Box" in response.text
+
+
+def test_can_search_box_by_note(client, db_session):
+    box = Box(name="普通箱子", note="里面放厨房锅具")
+    db_session.add(box)
+    db_session.commit()
+
+    response = client.get("/search?q=锅具")
+
+    assert response.status_code == 200
+    assert "普通箱子" in response.text
+
+
+def test_can_search_item_by_name(client, db_session):
+    box = Box(name="书房箱")
+    item = Item(name="电源延长线", box=box, is_container=False)
+    db_session.add_all([box, item])
+    db_session.commit()
+
+    response = client.get("/search?q=延长线")
+
+    assert response.status_code == 200
+    assert "电源延长线" in response.text
+    assert "位于箱子：书房箱" in response.text
+
+
+def test_can_search_item_by_note(client, db_session):
+    box = Box(name="工具箱")
+    item = Item(name="杂项", note="放备用螺丝刀", box=box, is_container=False)
+    db_session.add_all([box, item])
+    db_session.commit()
+
+    response = client.get("/search?q=螺丝刀")
+
+    assert response.status_code == 200
+    assert "杂项" in response.text
+
+
+def test_can_search_subitem_by_name(client, db_session):
+    box = Box(name="文件箱")
+    item = Item(name="文件袋", box=box, is_container=True)
+    subitem = SubItem(name="护照复印件", parent_item=item)
+    db_session.add_all([box, item, subitem])
+    db_session.commit()
+
+    response = client.get("/search?q=护照")
+
+    assert response.status_code == 200
+    assert "护照复印件" in response.text
+    assert "位于物品：文件袋 / 箱子：文件箱" in response.text
+
+
+def test_can_search_subitem_by_note(client, db_session):
+    box = Box(name="电子箱")
+    item = Item(name="配件盒", box=box, is_container=True)
+    subitem = SubItem(name="接口", note="备用转接头", parent_item=item)
+    db_session.add_all([box, item, subitem])
+    db_session.commit()
+
+    response = client.get("/search?q=转接头")
+
+    assert response.status_code == 200
+    assert "接口" in response.text
+
+
+def test_search_result_shows_item_box_info(client, db_session):
+    box = Box(name="客厅箱")
+    item = Item(name="相机", box=box, is_container=True)
+    db_session.add_all([box, item])
+    db_session.commit()
+
+    response = client.get("/search?q=相机")
+
+    assert response.status_code == 200
+    assert "位于箱子：客厅箱" in response.text
+    assert "容器" in response.text
+    assert "是" in response.text
+
+
+def test_search_result_shows_subitem_item_and_box_info(client, db_session):
+    box = Box(name="卧室箱")
+    item = Item(name="收纳袋", box=box, is_container=True)
+    subitem = SubItem(name="袜子", parent_item=item)
+    db_session.add_all([box, item, subitem])
+    db_session.commit()
+
+    response = client.get("/search?q=袜子")
+
+    assert response.status_code == 200
+    assert "位于物品：收纳袋 / 箱子：卧室箱" in response.text
+
+
+def test_search_page_handles_empty_query(client):
+    response = client.get("/search")
+
+    assert response.status_code == 200
+    assert "输入关键词后，可以跨 Box、Item、SubItem 进行搜索。" in response.text
+
+
+def test_search_page_handles_no_results(client):
+    response = client.get("/search?q=不存在的关键词")
+
+    assert response.status_code == 200
+    assert "没有找到匹配结果。" in response.text
+
+
+def test_search_result_renders_thumbnail_link_when_image_exists(client, db_session):
+    box = Box(name="图片箱")
+    db_session.add(box)
+    db_session.commit()
+
+    client.post(
+        f"/boxes/{box.id}/update",
+        data={"name": box.name, "note": "", "room": "", "status": ""},
+        files={"image_file": make_image_upload()},
+        follow_redirects=False,
+    )
+
+    response = client.get("/search?q=图片箱")
+
+    assert response.status_code == 200
+    assert f'/boxes/{box.id}/image' in response.text
+
+
+def test_search_result_without_image_does_not_break_template(client, db_session):
+    item = Item(name="无图物品", box=Box(name="普通箱"), is_container=False)
+    db_session.add(item)
+    db_session.commit()
+
+    response = client.get("/search?q=无图物品")
+
+    assert response.status_code == 200
+    assert "无图物品" in response.text