diff --git a/apps/web/app/components/browser/desktop-view.tsx b/apps/web/app/components/browser/desktop-view.tsx
index 9710e7e3..770389ee 100644
--- a/apps/web/app/components/browser/desktop-view.tsx
+++ b/apps/web/app/components/browser/desktop-view.tsx
@@ -3,7 +3,12 @@ import type { SiteListItem } from "@umt/contracts";
 import { Hand, Image as ImageIcon, LoaderCircle, Monitor, Power, RotateCw, Undo2 } from "lucide-react";
 import { useEffect, useRef, useState } from "react";
 import { toast } from "sonner";
-import { useBrowserControl, useCloseBrowserSession, useSiteBrowserSession } from "~/api/browser.ts";
+import {
+  useBrowserControl,
+  useBrowserReconnect,
+  useCloseBrowserSession,
+  useSiteBrowserSession,
+} from "~/api/browser.ts";
 import { LoadingState } from "~/components/console/empty-state.tsx";
 import { StatusBadge, type StatusTone } from "~/components/console/status-badge.tsx";
 import { Button } from "~/components/ui/button.tsx";
@@ -46,6 +51,19 @@ const CONTROLLER_TONE: Record<string, StatusTone> = {
 
 type Mode = "auto" | "screenshot";
 
+/** 画面加载后多久还没出图算黑屏 */
+const BLANK_TIMEOUT_MS = 5_000;
+
+/** 同源时看 Selkies 的视频流有没有出帧;跨源 / 拿不到文档时不判黑屏(只按 onLoad 判断) */
+function desktopBlank(frame: HTMLIFrameElement | null): boolean {
+  try {
+    const video = frame?.contentDocument?.querySelector("video");
+    return !!video && (video.readyState < 2 || video.videoWidth === 0);
+  } catch {
+    return false;
+  }
+}
+
 /** 原站视图 Tab:能用桌面模式就用,否则截图模式 */
 export function SiteOriginPanel({ site }: { site: SiteListItem }) {
   const session = useSiteBrowserSession(site.id);
@@ -99,13 +117,45 @@ function DesktopView({
   const refreshRole = () => void qc.invalidateQueries({ queryKey: qk.sub("browser", "desktop") });
   const [reloadKey, setReloadKey] = useState(0);
   const [loaded, setLoaded] = useState(false);
+  const frame = useRef<HTMLIFrameElement>(null);
+  /** 打开时确认失败 / 黑屏超时:交给 useAutoReconnect 自动重连一次 */
+  const [stuck, setStuck] = useState(false);
 
   const reloadDesktop = () => {
     setLoaded(false);
     setReloadKey((k) => k + 1);
   };
   // BR-3:浏览器服务(同一容器里的 Selkies)重启过 → 自动重连会话一次,成功后重建桌面连接
-  const rc = useAutoReconnect(site.id, s, false, reloadDesktop);
+  const rc = useAutoReconnect(site.id, s, stuck, () => {
+    setStuck(false);
+    reloadDesktop();
+  });
+
+  // INT-3(VER-3b):桌面 iframe 直连 Selkies,不经过截图 / 操作接口,不会触发服务端的被动重连 →
+  // 打开桌面时先调一次幂等的 reconnect(上游上下文还在时服务端什么都不做),失败再走自动重连
+  const ensure = useBrowserReconnect(site.id);
+  const { mutate: ensureMutate } = ensure;
+  const sid = s && s.controller !== "closed" ? s.id : null;
+  const ensured = useRef<string | null>(null);
+  useEffect(() => {
+    if (!sid || ensured.current === sid) return;
+    ensured.current = sid;
+    ensureMutate(sid, { onError: () => setStuck(true) });
+  }, [sid, ensureMutate]);
+
+  // 画面加载失败或黑屏超过 5 秒:每个会话自动重连一次(之后靠「重新连接」按钮)
+  const blankTried = useRef<string | null>(null);
+  // biome-ignore lint/correctness/useExhaustiveDependencies: reloadKey 变化 = 新一轮加载,重新计时
+  useEffect(() => {
+    if (!sid || blankTried.current === sid) return;
+    const t = setTimeout(() => {
+      if (loaded && !desktopBlank(frame.current)) return;
+      blankTried.current = sid;
+      console.debug("[browser] 桌面画面 5 秒未出图，自动重新连接一次", sid);
+      setStuck(true);
+    }, BLANK_TIMEOUT_MS);
+    return () => clearTimeout(t);
+  }, [sid, loaded, reloadKey]);
   // 别处(Agent 操作、截图)触发的重连成功后也重建桌面连接
   const reconnectedAt = s?.reconnect?.status === "ok" ? s.reconnect.at : null;
   const prevReconnect = useRef(reconnectedAt);
@@ -230,6 +280,7 @@ function DesktopView({
         ) : null}
         <iframe
           key={reloadKey}
+          ref={frame}
           title="浏览器桌面"
           src={status.path}
           onLoad={() => setLoaded(true)}
diff --git a/docs/runbook/browser.md b/docs/runbook/browser.md
index 722c629e..990bca15 100644
--- a/docs/runbook/browser.md
+++ b/docs/runbook/browser.md
@@ -268,6 +268,7 @@ pixelflux + labwc Wayland 桌面 + Selkies 2.0 Web 客户端)+ camofox 1.17.0 **
 | 初始化 | `init-umt-desktop` | 由 `CAMOFOX_ACCESS_KEY` 派生 Selkies 控制 / 只读口令;覆盖 labwc autostart;把 `/root/.camofox` 交给 `abc` |
 | 反代 | `apps/server/src/modules/desktop` | `/api/v1/browser/desktop/{sessionId}/*` → 容器 `:3000`(静态客户端 + `api/websockets`);只接受控制台会话 |
 | 前端 | `apps/web/app/components/browser/desktop-view.tsx` | 原站视图 Tab:桌面可用且是安全上下文 → 桌面模式;否则截图模式并说明原因;可手动切换 |
+| 自愈(INT-3) | 同上 | 打开桌面先调一次幂等 `POST /browser/sessions/{id}/reconnect`(iframe 直连 Selkies 不触发被动重连);画面 5 秒未加载或视频流未出帧 → 每个会话自动重连一次并重建桌面连接,之后靠「重新连接」按钮 |
 | HTTPS | compose `caddy`(profile `tls`)+ `docker/browser-desktop/Caddyfile` | 可选;已有反代终结 TLS 时不用 |
 
 窗口:无标题栏、最大化铺满 1280×900(`BROWSER_DESKTOP_WIDTH/HEIGHT`),`HARDEN_DESKTOP` 去掉终端 / sudo / xdg-open,