Abstract: As the wall of modern building envelope structure, aluminum veneer curtain wall has the characteristics of rich and changeable exterior decoration and strong expression. It has been widely used in the construction industry. The correct and reasonable application of aluminum veneer can guarantee the construction Quality, make the best use of materials. Aluminum veneer welding is prone to deformation, which affects the quality of the aluminum veneer, and even makes the entire aluminum veneer scrapped. Therefore,it is particularly important to prevent the welding deformation of the aluminum veneer. The study analyzed the characteristics of aluminum veneer, summarized the causes of aluminum veneer welding deformation, and set up a device to prevent aluminum veneer welding deformation, in order to provide a reference for solving the problem of aluminum veneer welding deformation.