The present invention provides a terminal single sign-on configuration, authentication method, and system. The terminal single sign-on authentication method includes obtaining a VPN login information for accessing a private virtual network, where the application service system is installed on a mobile terminal; and uploading the VPN login information to a server for verification. When the VPN login information is successfully verified, a recorded script associated with the VPN login information is obtained from the server, the recorded script containing a plurality of operations and login parameters corresponding to input controls in a user interface of the application service system for authentication. The method further includes according to the recorded script, automatically replaying the plurality of operations to input the login parameters to the corresponding input controls in the user interface, such that an authentication process for the application service system is completed automatically.