diff --git a/public/css/style.css b/public/css/style.css
index 9748e43..b7020a4 100644
--- a/public/css/style.css
+++ b/public/css/style.css
@@ -328,6 +328,35 @@ body {
   transform: rotate(30deg);
 }
 
+/* ---- Global Refresh Button ---- */
+.btn-refresh-global {
+  width: 32px;
+  height: 32px;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  background: var(--bg-card);
+  border: 1px solid var(--border-color);
+  border-radius: var(--radius-sm);
+  color: var(--text-secondary);
+  cursor: pointer;
+  transition: all 0.25s ease;
+  margin-left: 4px;
+  padding: 0;
+}
+
+.btn-refresh-global:hover {
+  border-color: var(--border-hover);
+  color: var(--accent-emerald);
+  background: rgba(16, 185, 129, 0.08);
+  transform: translateY(-1px);
+}
+
+.btn-refresh-global svg {
+  width: 16px;
+  height: 16px;
+}
+
 /* ---- Theme Switch ---- */
 .theme-switch-wrapper {
   display: flex;
diff --git a/public/js/app.js b/public/js/app.js
index 670dfa8..d8a4fd9 100644
--- a/public/js/app.js
+++ b/public/js/app.js
@@ -803,9 +803,30 @@
         <div class="user-info">
           <span class="username">${escapeHtml(username)}</span>
           <button class="btn btn-logout" id="btnLogout">退出</button>
+          <button class="btn-refresh-global" id="btnGlobalRefresh" title="全局数据刷新">
+            <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
+              <path d="M23 4v6h-6M1 20v-6h6M3.51 9a9 9 0 0 1 14.85-3.36L23 10M1 14l4.64 4.36A9 9 0 0 0 20.49 15"></path>
+            </svg>
+          </button>
         </div>
       `;
       document.getElementById('btnLogout').addEventListener('click', handleLogout);
+      document.getElementById('btnGlobalRefresh').addEventListener('click', async () => {
+        const btn = document.getElementById('btnGlobalRefresh');
+        const icon = btn.querySelector('svg');
+        if (icon) icon.style.animation = 'spin 0.8s ease-in-out';
+        
+        await Promise.all([
+          fetchNetworkHistory(true),
+          fetchMetrics(true)
+        ]);
+        
+        if (icon) {
+          setTimeout(() => {
+            icon.style.animation = '';
+          }, 800);
+        }
+      });
     } else {
       user = null;
       dom.btnSettings.style.display = 'none';