diff --git a/src/components/sidebar.js b/src/components/sidebar.js
index 9175362..8f65066 100644
--- a/src/components/sidebar.js
+++ b/src/components/sidebar.js
@@ -108,6 +108,22 @@ function _checkMultiInstances(el) {
   }).catch(() => {})
 }
 
+const LS_SIDEBAR_COLLAPSED = 'clawpanel_sidebar_collapsed'
+
+function _isDesktopSidebarCollapsed() {
+  try { return localStorage.getItem(LS_SIDEBAR_COLLAPSED) === '1' } catch { return false }
+}
+
+function _setDesktopSidebarCollapsed(collapsed) {
+  try { localStorage.setItem(LS_SIDEBAR_COLLAPSED, collapsed ? '1' : '0') } catch {}
+  const sidebar = document.getElementById('sidebar')
+  if (sidebar) {
+    sidebar.classList.toggle('sidebar-collapsed', !!collapsed)
+  }
+  const btn = document.getElementById('btn-sidebar-collapse')
+  if (btn) btn.textContent = collapsed ? '»' : '«'
+}
+
 export function renderSidebar(el) {
   const current = getCurrentRoute()
 
@@ -115,12 +131,14 @@ export function renderSidebar(el) {
   const isLocal = inst.type === 'local'
   const showSwitcher = !isLocal || _hasMultipleInstances
 
+  const collapsed = _isDesktopSidebarCollapsed()
   let html = `
     <div class="sidebar-header">
       <div class="sidebar-logo">
         <img src="/images/logo.png" alt="ClawPanel">
       </div>
       <span class="sidebar-title">ClawPanel</span>
+      <button class="sidebar-collapse-btn" id="btn-sidebar-collapse" title="折叠/展开">${collapsed ? '»' : '«'}</button>
       <button class="sidebar-close-btn" id="btn-sidebar-close" title="关闭菜单">&times;</button>
     </div>
     ${showSwitcher ? `<div class="instance-switcher" id="instance-switcher">
@@ -172,6 +190,9 @@ export function renderSidebar(el) {
 
   el.innerHTML = html
 
+  // 应用折叠态（桌面端）
+  _setDesktopSidebarCollapsed(collapsed)
+
   // 首次渲染时异步检测多实例
   if (!_delegated) _checkMultiInstances(el)
 
@@ -191,6 +212,13 @@ export function renderSidebar(el) {
         _closeMobileSidebar()
         return
       }
+      // 侧边栏折叠
+      const collapseBtn = e.target.closest('#btn-sidebar-collapse')
+      if (collapseBtn) {
+        _setDesktopSidebarCollapsed(!_isDesktopSidebarCollapsed())
+        // 不需要整体重渲染
+        return
+      }
       // 主题切换
       const themeBtn = e.target.closest('#btn-theme-toggle')
       if (themeBtn) {
diff --git a/src/style/layout.css b/src/style/layout.css
index 4b9c800..77a84c3 100644
--- a/src/style/layout.css
+++ b/src/style/layout.css
@@ -11,6 +11,38 @@
   overflow: hidden;
 }
 
+/* 桌面端折叠态 */
+#sidebar.sidebar-collapsed {
+  width: var(--sidebar-collapsed);
+}
+#sidebar.sidebar-collapsed .sidebar-title,
+#sidebar.sidebar-collapsed .nav-section-title,
+#sidebar.sidebar-collapsed .nav-item span,
+#sidebar.sidebar-collapsed .sidebar-meta,
+#sidebar.sidebar-collapsed .instance-switcher {
+  display: none;
+}
+#sidebar.sidebar-collapsed .sidebar-header {
+  justify-content: center;
+}
+#sidebar.sidebar-collapsed .nav-item {
+  justify-content: center;
+  padding-left: 0;
+  padding-right: 0;
+}
+#sidebar.sidebar-collapsed .nav-item svg {
+  opacity: 0.9;
+}
+#sidebar.sidebar-collapsed .sidebar-footer {
+  padding: var(--space-sm) 6px;
+}
+#sidebar.sidebar-collapsed #btn-theme-toggle {
+  justify-content: center;
+}
+#sidebar.sidebar-collapsed #btn-theme-toggle span {
+  display: none;
+}
+
 .sidebar-header {
   padding: var(--space-lg) var(--space-lg);
   display: flex;
@@ -475,9 +507,25 @@
   font-weight: 600;
   color: var(--text-primary);
 }
+.sidebar-collapse-btn {
+  margin-left: auto;
+  font-size: 14px;
+  color: var(--text-secondary);
+  background: none;
+  border: 1px solid var(--border-secondary);
+  cursor: pointer;
+  padding: 2px 8px;
+  border-radius: 8px;
+  line-height: 1.2;
+}
+.sidebar-collapse-btn:hover {
+  color: var(--text-primary);
+  background: var(--bg-glass-hover);
+}
+
 .sidebar-close-btn {
   display: none;
-  margin-left: auto;
+  margin-left: 6px;
   font-size: 22px;
   color: var(--text-tertiary);
   background: none;
@@ -511,6 +559,9 @@
   .mobile-topbar {
     display: flex;
   }
+  .sidebar-collapse-btn {
+    display: none;
+  }
   .sidebar-close-btn {
     display: block;
   }