The invention relates to an implementing method of a unified user management and single sign-on platform based on multiple application systems. The implementing method comprises a unified user management step and a single sign-on step, namely, when user information of the platform changes, automatically sending the user information to each application system; and when clicking the link of each application system, if the platform is verified, directly signing on without inputting a password. Existing independent application systems are integrated for enterprises. By means of the implementing method provided by the invention, responsibility can be positioned for information leakage of enterprises so as to provide a basis for responsibility investigation of enterprises. Meanwhile, the application systems of enterprises are integrated to one platform, and the functions of single sign-on, unified right and safety control to the systems of enterprises by users are provided, so that the risk of information leakage is reduced, the convenience is provided for the user's operation, and the office efficiency of enterprises and public institutions is improved.