A user management method of a shared network, where the method includes acquiring user management information from a user access management device, where the user management information includes identification information of a participant operator and invalid user information/valid user information, the invalid user information is used to indicate a user equipment that has been detached from a network of the participant operator but a user context is still retained in the user access management device, and the valid user information is used to indicate a user equipment attached to the network of the participant operator, and updating access user information of the participant operator according to the user management information. In addition, another user management method of a shared network, and a corresponding device and system are further provided.