Back-end authorization authentication method and system based on Oauth2.0 protocol

The invention provides a back-end authorization authentication method and system based on an Oauth2.0 protocol, and relates to the technical field of finance, and the method comprises the steps: calling an open bank authorization authentication H5 when a third-party APP obtains a financial service request initiated by a client; according to the authorization of the client, the third-party platform and the open bank are mutually trusted to log in, and according to the authorization authentication H5, the service access gateway calls an authorization authentication interface of the open bank and uploads a code generated by the third-party platform; an authorization module of the open bank calls a third-party platform through a third-party docking gateway, and obtains customer information of the third-party platform through a code; the authorization module performs verification and mutual trust processing according to the customer information, issues a login token to the customer according to an Oauth2.0 protoco