可以在网上退票，前提是你没有取票。退票需要按照比例扣除部分手续费。
具体操作如下：
1、打开电脑上的浏览器，搜索“12306”，进入12306官网。
2、进入到官网之后，点击“退票”按钮。
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3、进入到账号登录页面，输入12306账号登录，并进入个人中心页面。
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4、在“个人中心”页面，点击“已完成订单”。
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4、接着根据订票日期或者出行日期查询订单。
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5、查询到需要退票的订单之后，点击该订单后面的“退票”按钮，接着就是点击确认即可退票。
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