Anti-blocking roof drainage opening

The utility model discloses an anti-blocking roof drainage opening, relates to the technical field of roof drainage, and aims to solve the problem that drainage is not smooth due to the fact that a filter plate is blocked by accumulated dust, sundries and the like in an existing roof drainage opening. The drain gully is formed in a roof, the sewer pipe is fixedly connected to one end of the drain gully, a filter part is detachably connected to the side, away from the sewer pipe, of the drain gully, the lowest position of the filter part is higher than the plane of the roof, a deposition groove is formed in the outer edge of the drain gully of the roof, and a deposition ring is detachably connected into the deposition groove. According to the anti-blocking roof drainage port, the filtering piece arranged higher than the plane of the roof is matched with the deposition ring arranged lower than the plane of the roof, so that rainwater carrying impurities on the roof is blocked by the deposition groove before ent