Waterproof structure of expansion joint

The utility model discloses an expansion joint waterproof structure in the technical field of expansion joints, which comprises a wall body, an expansion joint is arranged in the wall body, bayonets arranged on the wall body are arranged on the left side and the right side of the top of the expansion joint, fixing plates are arranged in the bayonets in a matched mode, and the bottom ends of the fixing plates are connected with mounting plates through sliding assemblies. A water stop belt is jointly connected between the two mounting plates, a waterproof assembly is arranged above the top of the water stop belt, transverse plates attached to a wall body are arranged on the surface of the top end of the fixing plate, abutting plates are movably connected to the surfaces of the top ends of the opposite sides of the two transverse plates in a penetrating mode, and connecting grooves matched with the abutting plates are formed in the transverse plates. The side ends, far away from each other, of the two abutting p