Why do I have to register by SMS every time I log in Taobao?

This is because your browser's privacy setting is too high, or a private site is added to Taobao's website, which will lead to the problem of repeated login. You just need to set the level of ie- Tools-Internet Options-Privacy Settings to the lowest. After setting it to the minimum, you can log in to Taobao even if you block it on the privacy site. If you don't want to set the minimum, it is recommended to delete the information of Taobao in the station.