diff --git a/extensions/qa-matrix/src/runners/contract/scenario-runtime-cli.test.ts b/extensions/qa-matrix/src/runners/contract/scenario-runtime-cli.test.ts
index 7bc8a27882fd..bfabd142ef0a 100644
--- a/extensions/qa-matrix/src/runners/contract/scenario-runtime-cli.test.ts
+++ b/extensions/qa-matrix/src/runners/contract/scenario-runtime-cli.test.ts
@@ -3,13 +3,14 @@ import { mkdir, mkdtemp, readFile, rm, writeFile } from "node:fs/promises";
 import path from "node:path";
 import { setTimeout as sleep } from "node:timers/promises";
 import { resolvePreferredOpenClawTmpDir } from "openclaw/plugin-sdk/temp-path";
-import { describe, expect, it } from "vitest";
+import { describe, expect, it, vi } from "vitest";
 import {
   formatMatrixQaCliCommand,
   redactMatrixQaCliOutput,
   resolveMatrixQaOpenClawCliEntryPath,
   runMatrixQaOpenClawCli,
   startMatrixQaOpenClawCli,
+  testing,
 } from "./scenario-runtime-cli.js";
 
 function isProcessRunning(pid: number): boolean {
@@ -60,6 +61,38 @@ describe("Matrix QA CLI runtime", () => {
     ).toBe("GET /_matrix/client/v3/sync?access_token=abcdef…ghij");
   });
 
+  it("force-kills Windows CLI process trees when graceful taskkill fails", () => {
+    const platformDescriptor = Object.getOwnPropertyDescriptor(process, "platform");
+    Object.defineProperty(process, "platform", { value: "win32", configurable: true });
+    try {
+      const killMock = vi.fn();
+      const child = {
+        pid: 12345,
+        kill: killMock,
+      } as unknown as Parameters<typeof testing.killMatrixQaCliChild>[0];
+      const runTaskkill = vi
+        .fn()
+        .mockReturnValueOnce({ status: 1 })
+        .mockReturnValueOnce({ status: 0 });
+
+      testing.killMatrixQaCliChild(child, "SIGTERM", runTaskkill);
+
+      expect(runTaskkill).toHaveBeenNthCalledWith(1, "taskkill", ["/PID", "12345", "/T"], {
+        stdio: "ignore",
+        windowsHide: true,
+      });
+      expect(runTaskkill).toHaveBeenNthCalledWith(2, "taskkill", ["/PID", "12345", "/T", "/F"], {
+        stdio: "ignore",
+        windowsHide: true,
+      });
+      expect(killMock).not.toHaveBeenCalled();
+    } finally {
+      if (platformDescriptor) {
+        Object.defineProperty(process, "platform", platformDescriptor);
+      }
+    }
+  });
+
   it("prefers the ESM OpenClaw CLI entrypoint when present", async () => {
     const root = await mkdtemp(path.join(resolvePreferredOpenClawTmpDir(), "matrix-qa-cli-entry-"));
     try {
diff --git a/extensions/qa-matrix/src/runners/contract/scenario-runtime-cli.ts b/extensions/qa-matrix/src/runners/contract/scenario-runtime-cli.ts
index d6b9e9978d2f..9412d5661bab 100644
--- a/extensions/qa-matrix/src/runners/contract/scenario-runtime-cli.ts
+++ b/extensions/qa-matrix/src/runners/contract/scenario-runtime-cli.ts
@@ -1,5 +1,5 @@
 // Qa Matrix plugin module implements scenario runtime cli behavior.
-import { spawn as startOpenClawCliProcess } from "node:child_process";
+import { spawn as startOpenClawCliProcess, spawnSync } from "node:child_process";
 import { randomUUID } from "node:crypto";
 import { existsSync } from "node:fs";
 import { chmod, mkdir, mkdtemp, rm, stat, writeFile } from "node:fs/promises";
@@ -107,8 +107,32 @@ function formatMatrixQaCliTimeoutError(result: MatrixQaCliRunResult, timeoutMs:
 function killMatrixQaCliChild(
   child: ReturnType<typeof startOpenClawCliProcess>,
   signal: NodeJS.Signals,
+  runTaskkill: typeof spawnSync = spawnSync,
 ): void {
-  if (process.platform !== "win32" && child.pid) {
+  if (process.platform === "win32") {
+    if (child.pid) {
+      const args = ["/PID", String(child.pid), "/T"];
+      if (signal === "SIGKILL") {
+        args.push("/F");
+      }
+      const result = runTaskkill("taskkill", args, { stdio: "ignore", windowsHide: true });
+      if (!result.error && result.status === 0) {
+        return;
+      }
+      if (signal !== "SIGKILL") {
+        const forceResult = runTaskkill("taskkill", [...args, "/F"], {
+          stdio: "ignore",
+          windowsHide: true,
+        });
+        if (!forceResult.error && forceResult.status === 0) {
+          return;
+        }
+      }
+    }
+    child.kill(signal);
+    return;
+  }
+  if (child.pid) {
     try {
       process.kill(-child.pid, signal);
       return;
@@ -459,3 +483,7 @@ export async function createMatrixQaOpenClawCliRuntime(params: {
     stateDir,
   };
 }
+
+export const testing = {
+  killMatrixQaCliChild,
+};