Sandwich pot is also known as steam pot, digester, sandwich steam pot. Usually consists of a pot body and supporting feet. The boiler body is a double-layer structure composed of spherical inside and outside the pot body, and the middle interlayer is heated by steam. There are fixed, tilting, stirring and other styles. The sandwich pot has the characteristics of large heating area, high thermal efficiency, uniform heating, short boiling time of liquid and material, easy control of heating temperature, beautiful appearance, easy installation, convenient operation, safe and reliable. Sandwich pot is widely used in the processing of all kinds of food, can also be used in large restaurants or cantons to make soup, stew meat, porridge, etc., is a good equipment for food processing to improve quality, shorten time, and improve working conditions.