Abstract: The precision machining of the screw compressor rotor is realized by a special CNC screw rotor grinder. At present, most of the machines are provided by western developed countries, with long delivery periods, high prices, and potential risks of restricting exports to our country. Under this background, Taizhou Beiping Machine Tool Co., Ltd. developed a BPR6 screw rotor grinder; this article discusses several features of the machine′s key technologies, and the solutions proposed for two shortcomings of foreign technology, and the third-party test results, the comparison of domestic and foreign technical indicators and user usage and evaluation are explained in detail. Finally, the modal analysis of the whole machine tool and its components is carried out. The frequencies of the whole machine tool and its components are obtained, in which the first-order frequency of the whole machine tool is 70.96 Hz.