This machine tool is mainly used to process the inner holes and end faces of large gear parts. It can achieve the same set of grinding of the inner hole and the end face under the condition of clamping the workpiece at one time, and meet the verticality requirements of the end face to the inner hole. The machine tool can also realize the processing of many types of parts through the function transformation of the CNC system, such as: with inner taper holes, with step holes and other types of parts. The machine tool has a high degree of automation and can be equipped with automatic fixtures, which can be suitable for large and medium batch production requirements.