Multi-functional thresher is suitable for threshing and sorting of corn, millet, sorghum, castor seeds, millet and other basically straw-free grains; it can also be used for threshing of crops with long straws such as rape and soybeans.This thresher is composed of frame welded parts, roller, sieve, cover, feeding plate, belt pulley, discharge port, air drum assembly, screen mesh adapted to different grains, etc.