In order to improve the running accuracy and stability of the compressor, a pitch error compensation method suitable for Beckhoff PLC is designed. The compensation value of the corresponding position is calculated according to the error value of different points in the operation range of the feed shaft of the laser interferometer measurement equipment, and the positioning compensation of the equipment shaft is realized through the corresponding algorithm, so that the feed control accuracy is improved. The results show that the method can significantly improve the pitch error of the equipment axis, and significantly enhance the control accuracy of the equipment axis.