Abstract: Potato protein has high nutritional value, compared with other cereal proteins, it can make up for the low protein deficiencies of rice, wheat and other staple food raw materials, the market application potential is large. At present, China's potato processing mainly focuses on starch production, but the production process produces a large amount of protein in the wastewater. Efficient recovery of potato protein from wastewater can help increase China's food protein resources reserves, which has important social and economic value. This paper systematically reviews the advantages and disadvantages of various methods of potato protein extraction and their applications. The chemical method is widely used in practice, but the protein yield is low, and the potato protein recovered using the physical method has good quality and purity, but requires high equipment. The biological method is simpler and more efficient, but the treatment effect is greatly affected by temperature. Currently, potato protein is widely used in food processing, preservation materials and animal feed in China. And this paper also combines the existing research and production process, and designs the production equipment process of protein recovery from potato starch wastewater by acid thermal precipitation and ultrafiltration, in order to solve the problem of low protein yield and continuous production by ultrafiltration, improve the protein recovery rate and reduce the generation cost.