diff --git a/packages/components/qrcode/components/qrcode-canvas/qrcode-canvas.ts b/packages/components/qrcode/components/qrcode-canvas/qrcode-canvas.ts
index 433276030..9f478e0f5 100644
--- a/packages/components/qrcode/components/qrcode-canvas/qrcode-canvas.ts
+++ b/packages/components/qrcode/components/qrcode-canvas/qrcode-canvas.ts
@@ -24,7 +24,7 @@ export default class QRCode extends SuperComponent {
 
   methods = {
     async initCanvas() {
-      const query = wx.createSelectorQuery().in(this);
+      const query = this.createSelectorQuery();
       query
         .select('#qrcodeCanvas')
         .fields({ node: true, size: true })
@@ -140,7 +140,7 @@ export default class QRCode extends SuperComponent {
     // 暴露 canvas 节点给父组件
     getCanvasNode() {
       return new Promise((resolve) => {
-        const query = wx.createSelectorQuery().in(this);
+        const query = this.createSelectorQuery();
         query
           .select('#qrcodeCanvas')
           .fields({ node: true, size: true })
diff --git a/packages/components/qrcode/qrcode.ts b/packages/components/qrcode/qrcode.ts
index 5fd3c7feb..1bbd3be88 100644
--- a/packages/components/qrcode/qrcode.ts
+++ b/packages/components/qrcode/qrcode.ts
@@ -60,6 +60,14 @@ export default class QRCode extends SuperComponent {
   };
 
   methods = {
+    // 用于外部调用，重新绘制二维码
+    init() {
+      const canvasComp = this.selectComponent('#qrcodeCanvas');
+      if (canvasComp) {
+        canvasComp.initCanvas();
+      }
+    },
+
     handleDrawCompleted() {
       this.setData({
         canvasReady: true,
diff --git a/packages/components/watermark/watermark.ts b/packages/components/watermark/watermark.ts
index 62872102b..9dc972b01 100644
--- a/packages/components/watermark/watermark.ts
+++ b/packages/components/watermark/watermark.ts
@@ -37,7 +37,7 @@ export default class Watermark extends SuperComponent {
     },
 
     renderWatermark() {
-      const query = wx.createSelectorQuery().in(this);
+      const query = this.createSelectorQuery();
       query
         .select('#watermarkCanvas')
         .fields({ node: true, size: true })