With the background of automobile painting and the research object of four-door vehicle-mounted tooling,a new decomposable four-door general-purpose vehicle-mounted tooling was designed and applied.Firstly,according to the use of the four-door tooling on site,the problems and deficiencies of the existing four-door tooling were analyzed.Then,combined with the technical requirements of functionality,versatility,durability and easy maintenance,a new decomposable four-door general-purpose tool was designed.Finally the practical application test of the four-door tooling was carried out from the level of the set technical requirements multiple benefits and benefits.