The utility model discloses a remainder cleaning device for a screw conveyer on top of a grain dryer. A transverse shaft which is arranged in a conveying pipe of a machine body is provided with a screw rod which is used for conveying grains, the bottom part of the conveying pipe is provided with a through hole, and a leaking pipe is connected to the through hole. The utility model is characterized in that a damper is arranged between the leaking pipe and the conveying pipe. The top part of the damper forms an arc shape, and both sides of the damper are respectively provided with a fan-shaped connecting board which is connected with a mandrel. The mandrel is parallel to the screw rod in a same direction way. The damper utilizes that the mandrel is pivoted on the machine body, and the arc-shaped top surface of the damper is butted with the bottom part of the through hole. The control of the rotation of the mandrel causes the damper to open, and the damper can be opened manually or electrically. When used for cleaning the remainder of the screw conveyer which is arranged at the top part of the dryer, the utility model has the advantages of convenience and cleanness.