Waterproof structure of building design roof cornice

The invention discloses a waterproof structure of a building design roof cornice, and relates to the technical field of cornice waterproofness. The structure comprises a house body, a roof, a rainwater collecting tank, a drainage tank, a filter screen, a standby water tank, a domestic water tank, a transverse rod driven by a motor device and provided with a stirring rod, a movable cover plate device, an emergency drainage channel, a water suction pump, a water level gauge and a controller. When rainfall is large, rainwater impact force pushes the movable plate upwards to enable adjacent waterdripping nozzles to discharge rainwater together, thus the rainwater is guaranteed to be discharged in time, and the waterproof performance of the cornice is improved; the transverse rod with the stirring rod stirs a surface layer of a filter screen, sediments on the filter screen are prevented from preventing rainwater from flowing and being discharged; when the water level gauge detects rainwater, the cover plate is lif