diff --git a/packages/components/input-number/__tests__/input-number.test.tsx b/packages/components/input-number/__tests__/input-number.test.tsx
index c258ec4474..2adcdbb8de 100755
--- a/packages/components/input-number/__tests__/input-number.test.tsx
+++ b/packages/components/input-number/__tests__/input-number.test.tsx
@@ -594,4 +594,14 @@ describe('InputNumber.vue', () => {
     expect(increase.classes()).toContain('el-icon')
     expect(decrease.classes()).toContain('el-icon')
   })
+
+  // fix: #18275
+  test('step-strictly is true and should keep the initial value and step matching', () => {
+    const num = ref(2.6)
+    const wrapper = mount(() => (
+      <InputNumber v-model={num.value} stepStrictly step={0.5} />
+    ))
+    expect(wrapper.find('input').element.value).toBe(num.value.toString())
+    wrapper.unmount()
+  })
 })
diff --git a/packages/components/input-number/src/input-number.vue b/packages/components/input-number/src/input-number.vue
index 94765077c8..6c59974d34 100755
--- a/packages/components/input-number/src/input-number.vue
+++ b/packages/components/input-number/src/input-number.vue
@@ -222,6 +222,9 @@ const verifyValue = (
   }
   if (stepStrictly) {
     newVal = toPrecision(Math.round(newVal / step) * step, precision)
+    if (newVal !== value) {
+      update && emit(UPDATE_MODEL_EVENT, newVal)
+    }
   }
   if (!isUndefined(precision)) {
     newVal = toPrecision(newVal, precision)