As the best energy-saving building material recognized internationally, polyurethane sandwich panel has been quickly recognized by domestic and foreign construction markets for its excellent thermal insulation, sound insulation and fire resistance, and has a good market prospect. Compared with other types of sandwich panels, the advantages of polyurethane sandwich panels are mainly reflected in corrosion resistance, durability, compression and bending, heat insulation and fire prevention. In recent years, with the deepening of national energy conservation and emission reduction work, polyurethane sandwich panels have gradually been highly valued by the construction industry. According to the use position of the building, polyurethane sandwich panels can be divided into roof panels and wallboard. In addition, according to the needs of building facade decoration, polyurethane sandwich panels can also be divided into building thermal insulation decorative panels, building high-grade metal curtain wall panels, building external thermal insulation decorative panels, building characteristic functional decorative panels and so on. Due to its outstanding advantages, polyurethane sandwich panels are widely used. At present, polyurethane sandwich panels are mainly used for thermal insulation of the top or external wall of buildings, and also for building prefabricated houses, and some warehouses or freezers will also be used.