Digital identity authentication method and system

The invention discloses a digital identity authentication method and system. The method comprises the following steps: receiving a scene digital certificate application request and first identity information input by a user side, and applying second identity information to a CTID platform according to the first identity information; receiving second identity information, and generating third identity information based on the second identity information; establishing a mapping relation between the third identity information and the application scene information, obtaining a scene digital certificate and issuing the scene digital certificate to the user side; verifying the real-time biological characteristic information; and based on the scene digital certificate received by the user side, authenticating the business item handled by the user side. According to the invention, the whole process of identity authentication is realized based on the CTID platform, the mapping relation between the BID information and