The utility model relates to a lightweight compact electromagnetic repulsion mechanism, which belongs to the field of quick mechanical switch operating mechanisms and comprises a driving device, a holding device and a buffer device. Wherein the driving device comprises an opening coil, a closing coil and a repulsion disc and is used for providing driving force for opening and closing actions of the operating mechanism, and the retaining device comprises a spring, a piston, a spring base, a shell, a connecting plate and a bolt, is used for providing retaining force for the mechanism at an opening and closing position and is hinged with the repulsion disc through the connecting plate. According to the electromagnetic repulsion mechanism provided by the utility model, the retaining device, the buffer device and the driving device are tightly combined; compared with a generally designed electromagnetic repulsion mechanism, the electromagnetic repulsion mechanism has the advantages that thetotal mass of moving parts is reduced, meanwhile, the driving efficiency and maintainability of the electromagnetic repulsion mechanism are effectively improved on the premise that the maintaining and buffering performance is guaranteed, and the size and cost of a product are reduced.