Potassium sorbate is a food additive. Potassium sorbate can effectively inhibit the activities of mold, yeast and aerobic bacteria, and also prevent the growth and reproduction of harmful microorganisms such as Botox, Staphylococcus and Salmonella, but it is almost ineffective for beneficial microorganisms such as anaerobic Bacillus and Lactobacillus acidophilus, and its inhibitory effect is stronger than sterilization, thus effectively prolonging the storage time of food and maintaining the original flavor of food. Its anti-corrosion effect is 5- 10 times that of the similar product sodium benzoate.