The invention discloses a clearing device of machining scraps of valves for sewage treatment. The device comprises clearing rings; the surface of the clearing rings are fixedly connected with fixing rods; one ends of the fixing rods are fixedly connected with bearings; rolling wheels are fixedly connected to the surfaces of the bearings; sliding chutes are formed in one ends of the clearing rings;inner walls of the sliding chutes are connected with a first connecting plate in a sliding mode; and limiting holes are formed in the inner walls of the sliding chutes. According to the clearing device of the machining scraps of the valves for sewage treatment, a magnet rod fixedly connected to the surface of a second connecting plate attracts the metal scraps when the clearing device sucks and clears the metal scraps in the using process, so that the metal scraps are prevented from entering the interior of the clearing device, the service life of the clearing device is prolonged, normal operation of the clearing device is guaranteed, and then the problems that when the metal scraps are cleared, due to the fact that the metal is hard and can make contact with moving parts in a dust collector, the service life of the clearing device can be shortened, and the normal operation of the clearing device can be influenced are effectively solved.