Abstract: A device for locking a sealing interface of a maintenance window is provided, which includes: at least one articulated mechanism for hinging a cover plate and a shell of the maintenance window together; and at least one wrench component which is movably mounted on the cover plate and locks the cover plate and the shell in a rotary clamping manner. In addition, the device may further include a sealing element which is fixedly connected with the cover plate and the shell. the device implements locking of the sealing interface of the maintenance window in hinge and clamping manners, and the device is simple and rapid in operation, high in reliability and small in occupied space and may be widely applied to the technical field of communication equipment and other equipment.