The utility model relates to the technical field of agricultural m achinery, especially, relate to a take cleaning plant of threshing of turbofan selection by winnowing. Including the frame of threshing, locate and take off the material cylinder in the frame of threshing, concave grate, lie in the concave grate below grass discharge port, arrange row's grass board of grass, defeated millet chamber with the grass discharge port cooperation, lie in the defeated grain screw feeder of defeated millet intracavity, will fail the conveying trough of putting out cereal that corn that the conveying of grain screw feeder came was seen off, it still is equipped with defeated granary to fail the grain chamber and put out cereal between the conveyer trough, defeated granary storehouse chamber lower part has air inlet structure's a millet material passageway chamber for the bottom, and upper portion is dust collecting cavity, be provided with the dust absorption fan subassembly in the dust collecting cavity, dust collecting cavity communicates with each other and is connected with the dust exhaust mouth. The application is in small -size combined harvester's the portion of threshing, sets up by turbine fan, goes up aviation baffle, the dust absorption fan subassembly constituteed of aviation baffle down in defeated grain screw feeder and defeated granary top between the conveyer trough of putting out cereal, effectively gets rid of dust and careless considering to be worth doing in the grain through induced drafting. This application simple structure, it is even to induced draft, and the dust exhaust is effectual.