diff --git a/src/toast/README.zh-CN.md b/src/toast/README.zh-CN.md
index f908c4f72..3f9a760f7 100644
--- a/src/toast/README.zh-CN.md
+++ b/src/toast/README.zh-CN.md
@@ -166,7 +166,7 @@ Toast.resetDefaultOptions('loading');
 | position | 位置，可选值为 `top` `bottom` | _string_ | `middle` |
 | message | 文本内容，支持通过`\n`换行 | _string_ | `''` | - |
 | icon | 自定义图标，支持传入[图标名称](#/zh-CN/icon)或图片链接 | _string_ | - |
-| iconSize | 自定义图标大小，如 `20px` `2em`，默认单位为 `px` | _number \| string_ | `36px` |
+| iconSize | 图标大小，如 `20px` `2em`，默认单位为 `px` | _number \| string_ | `36px` |
 | iconPrefix | 图标类名前缀，同 Icon 组件的 [class-prefix 属性](#/zh-CN/icon#props) | _string_ | `van-icon` |
 | overlay | 是否显示背景遮罩层 | _boolean_ | `false` |
 | forbidClick | 是否禁止背景点击 | _boolean_ | `false` |
diff --git a/src/toast/Toast.tsx b/src/toast/Toast.tsx
index 976ef0df7..fa567df07 100644
--- a/src/toast/Toast.tsx
+++ b/src/toast/Toast.tsx
@@ -83,14 +83,14 @@ export default defineComponent({
     };
 
     const renderIcon = () => {
-      const { icon, type, iconPrefix, loadingType } = props;
+      const { icon, type, iconSize, iconPrefix, loadingType } = props;
       const hasIcon = icon || type === 'success' || type === 'fail';
 
       if (hasIcon) {
         return (
           <Icon
             name={icon || type}
-            size={props.iconSize}
+            size={iconSize}
             class={bem('icon')}
             classPrefix={iconPrefix}
           />
@@ -98,7 +98,9 @@ export default defineComponent({
       }
 
       if (type === 'loading') {
-        return <Loading class={bem('loading')} type={loadingType} />;
+        return (
+          <Loading class={bem('loading')} size={iconSize} type={loadingType} />
+        );
       }
     };
 
diff --git a/src/toast/test/index.spec.ts b/src/toast/test/index.spec.ts
index d7b5af1b6..80e987422 100644
--- a/src/toast/test/index.spec.ts
+++ b/src/toast/test/index.spec.ts
@@ -74,3 +74,17 @@ test('should change icon size when using icon-size prop', async () => {
   await later();
   expect(wrapper.find('.van-icon').style.fontSize).toEqual('10px');
 });
+
+test('should change loading icon size when using icon-size prop', async () => {
+  const wrapper = mount(Toast, {
+    props: {
+      show: true,
+      type: 'loading',
+      iconSize: '10',
+    },
+  });
+
+  await later();
+  expect(wrapper.find('.van-loading__spinner').style.width).toEqual('10px');
+  expect(wrapper.find('.van-loading__spinner').style.height).toEqual('10px');
+});