Single sign-on system and method, storage medium and electronic device

The invention relates to a single sign-on system and method, a storage medium and an electronic device, and aims to solve the problem that a closed business application server outside an enterprise and existing single sign-on services inside the enterprise cannot be integrated in related technologies. The single sign-on system comprises a user terminal, a bridging server and an authentication server. The bridging server is connected with the user terminal and the authentication server, a trust relationship is established between the bridging server and an application server, and the application server allows the user terminal obtaining an authentication bill of the bridging server to log in. The bridging server is used for bridging the application server when receiving a request of the user terminal for accessing the application server for the first time. The application server is used for receiving the user identification information and the first login authentication information returned by the authenticati