Multi-application-system unified login method and device

The invention provides a multi-application-system unified login method. The method comprises the following steps that a server establishes a user information view through Mysql; the server receives user information sent by a client, and generates a login key after verification is successful; the login key is carried in an application system access address and the application system access addressis sent; the client receives the application system access address and accesses an application system; the server determines whether an access source is safe and whether the login key is valid, and after the verification is successful, the application system establishes a login session credential based on the user information; and the client logs in the application system through the session credential. The invention also provides a multi-application-system unified login device. In the invention, through a same client, the different application systems can be logged in, and the different kindsof user identity verifica