Surface treatment device for powder metallurgy gear of automobile engine

The invention discloses an automobile engine powder metallurgy gear surface treatment device, and relates to the technical field of magnetron sputtering coating. The device comprises a shell, a driving assembly is fixedly arranged at the bottom end in the shell, an expansion assembly and an inclination assembly are movably arranged on the driving assembly, and the inclination assembly is arranged around the expansion assembly; the driving assembly comprises a fixing disc, the fixing disc is movably connected with the sliding blocks through a plurality of driving arms, each sliding block is movably connected with the inclined assembly, a bearing assembly is arranged in the inclined assembly, and a to-be-treated gear is fixedly arranged in the bearing assembly. According to the gear coating device, the coating angle of a to-be-treated gear is inclined through the inclined assembly, compared with a reverse face structure of an existing device, the gear is inclined at the corresponding angle, the problem that coa