Maintenance-free integrated drainage bridge expansion joint

The maintenance-free integrated drainage bridge expansion joint comprises fixing blocks, a first sliding groove is formed in the right side of the fixing block on the left side in a penetrating mode, first springs are fixedly connected to the left side and the right side of the inner wall of the first sliding groove correspondingly, and a sliding limiting block is fixedly connected between the tops of the first springs; a fixing plate is fixedly connected to the right side of the sliding limiting block, a sliding plate is fixedly connected to the lower position of the top of the right side of the fixing plate, a limiting head is fixedly connected to the right end of the sliding plate, and evenly-distributed grooves are formed in the top of the fixing block on the right side in a penetrating mode. The sliding plate plays a role of a drainage groove, the height of the sliding space is enough, rainwater cannot enter the cavity between the limiting cover plate and the bearing plate, and therefore the situation th