Disclosed in the present invention are a multi-application-oriented user data management method and system. The method comprises a first application module receives an access instruction input by a first user, the first application module generates an authority request information according to the access instruction, wherein the authority request information includes information of the first application corresponding to the first application module, a platform server or an authority data storage server calls a user authority data of the first application according to the authority request information, and return the user authority data to the first application module, and the first application module obtains user data orienting to the first user of the first application according to the user authority data and user information of the first user.