Potassium 4-methoxysalicylate (potassium 4-methoxysalicylate) has a structure similar to salicylic acid. It is a new medicinal whitening ingredient that is used in cosmetics to play a whitening effect. It is a cosmetic functional ingredients. Potassium 4-methoxysalicylate can coordinate keratin metabolism, correct abnormal epidermal hyperplasia, promote the discharge of melanin, and achieve skin smoothness and whitening; it can also block the source of melanin production and improve self-healing ability. , which can be used in conjunction with various types of whitening products to improve the whitening effect and has good development prospects.