Self-cleaning winnowing machine for household garbage

The utility model discloses a self-cleaning winnowing machine for household garbage. The device comprises a circulating air system, a box body, a belt conveyor, an air return port filtering device, arack and a self-cleaning device, the rack is mounted at the bottom of the box body; a feeding hole is formed in the left end of the top of the box body; the left end of the bottom of the box body is provided with a heavy substance discharge port corresponding to the feed port; wherein a light substance discharging port is formed in the right end of the bottom of the box body, the circulating air system is connected with the box body through a circulating pipeline, the bottom of the box body is connected with the belt conveyor, the air return port filtering device is installed at the bottom ofthe box body, and the self-cleaning device is arranged in the box body at an inclined angle. By using the circulating air system, the return air inlet filtering device can be effectively prevented from being blocked in the ope