The separated whey protein is a high-purity whey protein obtained by further processing on the basis of concentrated whey protein, and the purity can reach more than 90%. It is expensive, 2-3 times that of concentrated whey protein, but it is also easier to digest and absorb. The real beauty of whey protein separation lies in its nutritional value. Its high-quality protein content can provide high-quality protein for some people with special needs, such as infants and inpatients. In addition, the separation of bioactive compounds such as α-whey protein, β-lactoglobulin, lactoferrin and immunoglobulin contained in whey protein has injected fresh vitality into the market.