The multi-layer rotary grain cleaning machine is particularly suitable for cleaning and grading large-capacity granular materials to remove large and small impurities, and is widely used in grain, feed, food, chemical and brewing industries. The multi-layer rotary grain cleaning machine is equipped with a suction system, which can also pre-clean and clean raw grains and seeds, grade them according to particle size, and use a dust suction system to remove large and small impurities and dust.