.form-x{
border: 1px solid red;
& .el-form-item__label{
float: none;
word-break: break-word;
}
<el-form class="form-x" ref="form" :model="sizeForm" :rules="rulesForm">
<el-form-item label="1.姓名" prop="name">
<el-input v-model="sizeForm.name" readonly></el-input>
</el-form-item>