Whey protein peptide is a kind of polypeptide with multiple biological functions, which is obtained from whey protein extracted from milk by complex enzyme hydrolysis and specific small molecule separation technology. Its nutritional property is better than that of the parent large molecule whey protein, and it can be used for the upgrading product development of market whey protein. Whey protein peptide has multiple biological functions, so it can be widely used in sports nutrition, special diet, protein fortified food, health and health food and other fields of product development.