A cotton cleaning machine, comprising an upper cotton box, a double-layer roller feeding device, a beating device, a combing and dedusting device and a frame. The characteristics are: the cotton head includes a cotton box body connected to the cotton inlet. The air vent plate is fixedly arranged on both sides of the cotton box body, and the air vent plate is provided with a sliding air vent plate for adjusting the air volume. The air vent plate is provided with a return air duct connected to the dust filter duct. There is a swing plate bracket fixed on the cotton box body, a swing plate bracket fixed on the swing plate, a baffle fixed on the swing plate, a long round hole on the swing plate, a baffle sliding along the swing plate, and the swing plate bracket has an arc-shaped long round hole. The swing plate can swing on the swing plate bracket. The cotton box feeds the cotton layer horizontally evenly and feeds the cotton smoothly. In addition, the two-layer roller middle accumulation problem is effectively solved, the dedusting efficiency is high, the cotton can be controlled, the process adjustment is convenient, and the material adaptability is strong.