<el-form-item label="状态">
  <el-select
    v-model="searchFormState.Status"
    style="width: 100px"
    class="filter-item"
    placeholder="请选择"
  >
    <el-option
      v-for="(key, value) in statusMap"
      :key="key"
      :label="key"
      :value="value"
    />
  </el-select>
</el-form-item>

将值用 "Number(value)" 括一下

<el-form-item label="状态">
  <el-select
    v-model="searchFormState.Status"
    style="width: 100px"
    class="filter-item"
    placeholder="请选择"
  >
    <el-option
      v-for="(key, value) in statusMap"
      :key="key"
      :label="key"
      :value="Number(value)"
    />
  </el-select>
</el-form-item>