Abstract: Turbine blades are one of the core components of aircraft engines, and the turbine blades are connected to the turbine disc by mortise and tenon grooves. Therefore, the machining quality of the mortise and tenon grooves of the turbine disc has a very important impact on the failure and service life of the disc. At present, the commonly used CNC machining process in factories mainly uses the method of broaching to process tenons and grooves, and then manually polishing and rounding the tenons and grooves. This may lead to issues such as low surface accuracy, poor consistency, and low efficiency. A reverse toroidal cutting tool that meets the requirements of tenon groove rounding has been designed, and a milling method has been used to conduct rounding tests on the tenon groove of the turbine disc. The goal is to reduce the surface roughness of the machining and optimize the milling parameters, laying a foundation for the research on edge rounding treatment of the tenon groove of the wheel disc.