Polyvinylpyrrolidone (polyvinylpyorrlidone), referred to as PVP, is a non-ionic polymer, is the most distinctive N – vinyl amide polymer, and has been the most in- depth and extensive study of fine chemical varieties. At present, it has developed into non-ionic, cationic, anion 3 categories, industrial grade, pharmaceutical grade, food grade 3 specifications, relative molecular mass from thousands to more than one million homopolymer, copolymer and crosslinked polymer series products, and with its excellent unique properties are widely used. As a synthetic water-soluble polymer compound, PVP has the general properties of water- soluble polymer compounds: colloidal protection, film formation, adhesion, hygroscopicity, solubilization or condensation. However, the most distinctive feature of it is its excellent solubility and physiological compatibility. In synthetic polymers like PVP, which is both soluble in water and soluble in most organic solvents, has low toxicity and good physiological compatibility, especially in the fields of medicine, food, cosmetics, which…