Abstract: In order to achieve the machining removal of the impeller welding groove, an experimental study was carried out for the automatic machining of the impeller welding groove by robot. A self-built robot automatic machining system platform was used to process the impeller welding joint with a cylindrical rotary file as a machining tool, and a material removal model was established. The theoretical equation of material removal rate is simulated and analyzed by using Matlab software. The single factor experiment verifies the influence rule of main processing parameters on material removal rate. The optimum combination of process parameters was established based on orthogonal test. The results show that this platform system can completely replace manual operation to achieve automatic processing, with stable processing quality and high efficiency. In a certain range, the material removal rate is directly proportional to the feed speed, cutting speed, radial cutting depth and axial cutting depth, and the radial cutting depth has a greater impact on it, the axial cutting depth and feed speed of the second, the spindle speed has the smallest impact on it.