The invention discloses a method for realizing user identity digitalization based on a block chain. The method comprises the following steps: S1, monitoring a state of an API registration port; S2, inputting identity information; S3, performing identity information
authentication, i.e., checking user identities through a police real name
authentication system and bankcard binding mode according to information input by users in a registrant name input window, a registrant identity card number input window and a
bank card number input window; S4, registering a platform account, and distributing block chain identities to the users; S5, setting a
payment password; and S6, performing platform transaction. The method is a digital transaction method under the support of a block chain technology. According to the invention, under the
technical support of a third-party service platform, the block chain identities can be provided for the users, it is ensured that the users can carry out digital economic transaction under the block chain technology, the security and the
confidentiality are quite high, the transaction content cannot be tampered,
traceability can also be performed in case of a transaction problem, and the transaction reliability is improved.