display: flex;

  align-items: baseline;
 

  <view class="main-price-view">
        <label class="price-unit">￥</label>
        <label class="price-title">100</label>
      </view>

.main-price-view{
  font-family: PingFang SC, PingFang SC;
  font-weight: 600;
  font-size: 40rpx;
  color: #333333;
  text-align: left;
  display: flex;
  align-items: baseline;
  .price-unit{
    font-size: 20rpx;
    color: rgba(226, 30, 49, 1);
  // margin-bottom: 10rpx;
  }
  .price-title{
    font-weight: 600;
    font-size: 40rpx; 
    color: rgba(226, 30, 49, 1);
  }
        }