The whole machine is made of sus312 stainless steel material, which conforms to the industry standard of food processing equipment, which is convenient for cleaning after finishing work. This machine is composed of three parts: primary conveying, secondary conveying and grading roller group. The grading roller group is composed of at least two rollers with upper thickness and lower fineness. The gap between the two rollers that can sort shrimp can be automatically completed. The whole production process from transporting to sorting shrimp greatly improves production efficiency. This machine adopts numerical control to adjust the shrimp specifications, and the accuracy reaches the industry standard. It is an ideal processing equipment for the aquatic product processing industry.