Login control method and device, equipment and medium

The invention provides a login control method and device, equipment and a medium, and the method comprises the steps: receiving a service request message which is used for obtaining a service provided by a first application system, and comprises first account information which initiates the service request message; whether a global login certificate corresponding to the first account information exists or not is determined, a first result is obtained, the global login certificate indicates that a second application system is logged in based on the first account information, the first account information has the use permission of multiple application systems, and the first application system and the second application system belong to the multiple application systems respectively; according to the first result, the first application system is logged in, and the technical problem that in the prior art, login control is difficult to achieve, and the login control effect is affected is solved. 本公开提出一种登录控制方法、装置、设备