Spraying polyurethane rigid foam is a new type of high molecular polymer thermal insulation, waterproof and heat insulation material, which is made of isocyanate and polyol as main raw materials, under the action of foaming agent, catalyst, flame retardant, foam homogenizer and other additives, and is uniformly mixed by special equipment, sprayed under high pressure, and foamed on site, It has a continuous, sensitive and dense epidermis and a high strength interconnected wall bee with a closure rate of more than 95%