Building design roof cornice waterproof structure

The utility model discloses a building design roof cornice waterproof structure which comprises a roof wall body, the right side of the roof wall body is fixedly connected with a cornice body, the middle axis position of the bottom of the cornice body is communicated with a drainage pipe, and the bottoms of the rear side and the front side of an inner cavity of the drainage pipe are fixedly connected with supporting plates. The top of the supporting plate is fixedly connected with a spring, and the top of the spring is fixedly connected with a filter screen cylinder. Through cooperation of the roof wall, the tiles, the fixing blocks, the cornice body, the drainage pipe, a supporting plate, a spring, a filter screen cylinder, a floating ball, a liquid level sensor, a supporting block, a shell, a motor, a threaded rod, a connecting frame, a scraping plate, a brush and a buzzer, the problems that an existing roof cornice waterproof structure is prone to being blocked by sundries, so that rainwater cannot be drai