diff --git a/scripts/e2e/lib/plugins/fixtures.sh b/scripts/e2e/lib/plugins/fixtures.sh
index 0b6aee977e92..4776954ee91e 100644
--- a/scripts/e2e/lib/plugins/fixtures.sh
+++ b/scripts/e2e/lib/plugins/fixtures.sh
@@ -9,12 +9,45 @@ openclaw_plugins_cleanup_fixture_servers() {
     [[ -f "$pid_file" ]] || continue
     pid="$(cat "$pid_file" 2>/dev/null || true)"
     if [[ "$pid" =~ ^[0-9]+$ ]]; then
-      kill "$pid" 2>/dev/null || true
+      openclaw_plugins_stop_fixture_process "$pid"
     fi
     rm -f "$pid_file"
   done
 }
 
+openclaw_plugins_signal_fixture_process() {
+  local pid="$1"
+  local signal="$2"
+  if kill -0 -- "-$pid" >/dev/null 2>&1; then
+    kill "-$signal" -- "-$pid" >/dev/null 2>&1 || true
+    return
+  fi
+  kill "-$signal" "$pid" >/dev/null 2>&1 || true
+}
+
+openclaw_plugins_fixture_process_alive() {
+  local pid="$1"
+  kill -0 "$pid" >/dev/null 2>&1 || kill -0 -- "-$pid" >/dev/null 2>&1
+}
+
+openclaw_plugins_stop_fixture_process() {
+  local pid="$1"
+  local _
+  local attempts="${OPENCLAW_PLUGINS_FIXTURE_STOP_ATTEMPTS:-40}"
+  local interval="${OPENCLAW_PLUGINS_FIXTURE_STOP_INTERVAL_SECONDS:-0.25}"
+  if declare -F openclaw_e2e_stop_process >/dev/null 2>&1; then
+    openclaw_e2e_stop_process "$pid"
+    return
+  fi
+  openclaw_plugins_signal_fixture_process "$pid" TERM
+  for _ in $(seq 1 "$attempts"); do
+    ! openclaw_plugins_fixture_process_alive "$pid" && { wait "$pid" >/dev/null 2>&1 || true; return; }
+    sleep "$interval"
+  done
+  openclaw_plugins_signal_fixture_process "$pid" KILL
+  wait "$pid" >/dev/null 2>&1 || true
+}
+
 openclaw_plugins_print_fixture_log() {
   local log_file="$1"
   if declare -F docker_e2e_print_log >/dev/null 2>&1; then
diff --git a/test/scripts/plugins-assertions.test.ts b/test/scripts/plugins-assertions.test.ts
index fa324069346d..490e9281a7bb 100644
--- a/test/scripts/plugins-assertions.test.ts
+++ b/test/scripts/plugins-assertions.test.ts
@@ -79,6 +79,24 @@ function writeFixtureServerShims(binDir: string, pidPath: string): void {
   writeFileSync(pidPath, "");
 }
 
+function writeStubbornFixtureServerShims(binDir: string, pidPath: string): void {
+  mkdirSync(binDir, { recursive: true });
+  writeFileSync(
+    path.join(binDir, "node"),
+    [
+      "#!/bin/bash",
+      'printf "%s\\n" "$$" >"$OPENCLAW_TEST_FIXTURE_SERVER_PID"',
+      "trap ':' TERM",
+      "while true; do /bin/sleep 1; done",
+      "",
+    ].join("\n"),
+  );
+  writeFileSync(path.join(binDir, "sleep"), "#!/bin/bash\nexit 0\n");
+  chmodSync(path.join(binDir, "node"), 0o755);
+  chmodSync(path.join(binDir, "sleep"), 0o755);
+  writeFileSync(pidPath, "");
+}
+
 function writeCrashingFixtureServerShim(binDir: string): void {
   mkdirSync(binDir, { recursive: true });
   writeFileSync(
@@ -327,6 +345,51 @@ test -d "$OPENCLAW_PLUGINS_TMP_DIR"
     }
   });
 
+  it("force-kills stubborn npm fixture registry children during cleanup", () => {
+    const root = mkdtempSync(path.join(tmpdir(), "openclaw-plugin-npm-fixture-kill-"));
+    try {
+      const binDir = path.join(root, "bin");
+      const fixtureDir = path.join(root, "fixture");
+      const pidPath = path.join(root, "server.pid");
+      mkdirSync(fixtureDir);
+      writeStubbornFixtureServerShims(binDir, pidPath);
+
+      const result = spawnSync(
+        "/bin/bash",
+        [
+          "-c",
+          [
+            "set -euo pipefail",
+            "source scripts/e2e/lib/plugins/fixtures.sh",
+            "set +e",
+            `( start_npm_fixture_registry fixture-pkg 1.0.0 ${shellQuote(path.join(root, "fixture.tgz"))} ${shellQuote(fixtureDir)} )`,
+            'status="$?"',
+            "set -e",
+            '[ "$status" != "0" ]',
+          ].join("\n"),
+        ],
+        {
+          cwd: process.cwd(),
+          encoding: "utf8",
+          env: {
+            ...process.env,
+            OPENCLAW_PLUGINS_FIXTURE_STOP_ATTEMPTS: "2",
+            OPENCLAW_PLUGINS_FIXTURE_STOP_INTERVAL_SECONDS: "0.05",
+            OPENCLAW_TEST_FIXTURE_SERVER_PID: pidPath,
+            PATH: `${binDir}${path.delimiter}/usr/bin${path.delimiter}/bin`,
+          },
+        },
+      );
+
+      expect(result.status, result.stderr || result.stdout).toBe(0);
+      const pid = Number(readFileSync(pidPath, "utf8"));
+      expect(Number.isInteger(pid)).toBe(true);
+      waitForDead(pid);
+    } finally {
+      rmSync(root, { force: true, recursive: true });
+    }
+  });
+
   it("bounds npm fixture registry logs when readiness fails", () => {
     const root = mkdtempSync(path.join(tmpdir(), "openclaw-plugin-npm-fixture-log-"));
     try {