Potassium cinnamate is the natural potassium salt of cinnamic acid, is also a new product developed in the field of food preservatives at present, non-toxic and harmless to human body, safe and convenient, and has a variety of health functions for human body, so it has great development and application prospects, its appearance has caused shock in the food preservative preservation industry. As a natural food preservative, potassium cinnamate has the following characteristics: it has strong antibacterial activity, especially against the molds, bacteria and yeasts that cause food spoilage.