<template>
  <div>
    <el-form ref="form" label-width="100px">
      <el-form-item label="日期：" class="date_box">
        <el-date-picker v-model="time" type="date" :clearable="true" format='yyyy-MM-dd' value-format='yyyy-MM-dd' prefix-icon="''" placeholder="请输入" @mouseover.native="setTimeIcon" @mouseleave.native="iconVisable=false">
        </el-date-picker>
        <i :class="['el-icon-date',iconVisable == false ?'data_icon':'data_display']"></i>
      </el-form-item>
    </el-form>
    {{time}}
  </div>
</template>

<script>
export default {
  data () {
    return {
      time: '',
      iconVisable: false,
    }
  },
  mounted () {

  },
  methods: {
    setTimeIcon () {
      if (this.time == '' || this.time == null) {
        this.iconVisable = false
      }
      this.iconVisable = true
    },

  }
}
</script>

<style lang="less" scoped>
.date_box {
  position: relative;
  width: fit-content;
}

.data_icon {
  display: block;

  position: absolute;
  top: 50%;
  right: 8px;
  z-index: 9;
  color: #c0c4cc;
  font-size: 14px;
  transform: translateY(-50%);
}

.data_display {
  display: none;
}
</style>

或者图标写死

<template>
  <div>
    <el-form ref="form" label-width="100px">
      <el-form-item label="日期：" class="date_box">
        <el-date-picker v-model="time" type="date" :clearable="false" format='yyyy-MM-dd' value-format='yyyy-MM-dd' prefix-icon="''" placeholder="请输入">
        </el-date-picker>
      </el-form-item>
    </el-form>
    {{time}}
  </div>
</template>

<script>
export default {
  data () {
    return {
      time: ''
    }
  },
  mounted () {
    document.querySelector('.el-input__suffix').className += ' el-icon-date'
  }
}
</script>

<style lang="less" scoped>
/deep/.el-icon-date {
  right: 16px;
  color: #c0c4cc;
  font-size: 16px;
}
</style>