The impurities and bad products in corn raw grain mainly come from two aspects. On the one hand, due to the popularization of agricultural mechanization, some impurities such as corn bran are doped in corn threshing; On the other hand, corn is prone to mildew and other deterioration due to improper storage. This brings raw material quality problems to subsequent processing. Therefore, defective products and impurities should be removed during re processing of corn to ensure the quality of raw materials. The good and bad products in corn raw grain are shown in the figure. Therefore, corn sorting has become