Due to the strong polarity and high activity of isocyanate groups and urethane groups in the polyurethane adhesive, it has good chemical adhesion with materials containing active hydrogen, such as foam, wood, leather, fabric, paper, ceramics and other porous materials. Materials and materials with smooth surfaces such as glass, metal, rubber, plastic, etc. The hydrogen bonding between the polyurethane and the bonded material enhances the intramolecular force, making the bond stronger. Adhesives with different hardness and elongation can be obtained by adjusting the ratio and structure of soft and hard segments in the cured molecule. Its adhesive layer can be adjusted arbitrarily from flexibility to rigidity. At the same time, the polyurethane adhesive can be cured by heating or at room temperature. The bonding process is simple and the operation performance is excellent. The cured polyurethane adhesive has high strength, good wear resistance, water resistance, oil resistance, solvent resistance, chemical resistance and ozone resistance. Therefore, it has a wide range of applications in various fields of the national economy such as construction, industry, and automobiles.