Disclosed are an identity authentication, number saving and sending, and number binding method, apparatus and device. The identity authentication method comprises: receiving a user identity authentication request sent by a data authentication platform client, wherein the user identity authentication request comprises user authentication information and user identification information, and a data authentication platform server pre-stores the user authentication information and a registration number and a password, which correspond to the user identification information; acquiring, according to the user identification information, the user authentication information pre-stored in the data authentication platform server; matching the user authentication information in the acquired user identity authentication request with the acquired user authentication information pre-stored in the data authentication platform server; when the matching is successful, receiving a result, sent by the data authentication platform client, of confirming the acquisition of the registration number by a user.