PVP, as a synthetic water-soluble polymer compound, has the general properties of water-soluble polymer compounds, including colloid protection, film-forming, bonding, moisture absorption, solubilization or coagulation. However, its most distinctive feature is its excellent solubility and physiological compatibility, which have attracted attention. In the synthesis of polymers, PVP, which is soluble in both water and most organic solvents, has low toxicity, and good physiological compatibility, is not commonly seen. Especially in fields closely related to human health such as medicine, food, and cosmetics, with the decrease in the price of its raw material butyrolactone, it will undoubtedly demonstrate its good development prospects.