Abstract: Many of the inner teeth or splines on the drive shafts of aero engines and new energy vehicles are processed on the inner walls of blind holes, and now most of them use tooth-by-tooth cutting, which is inefficient, large tool loss, and follow-up deburring requirements; Extrusion process equipment is expensive, complex process, and is not suitable for high hard materials. A new process of electrolytic processing of internal teeth was proposed, and a multi-station electric vehicle transmission shaft inner tooth processing machine was developed, the main work included machine tool structure design, control system development, etc. Basic process experiments were carried out, the effect was good, and the design achieved the expected purpose.