In view of the high efficiency and high precision machining of large scale slewing bearing,through the way of independent innovation,the combined machine tool for processing large scale slewing bearing was researched .Focus on the capture of the overall structure of the machine tool design,high speed and high precision numerical control process technology and automatic process control program,high speed cutting heat transfer and temperature field control,high speed cutting tools and other key technical problems,a high precision and high speed CNC modular machine tool for processing large slewing bearing was developed,which could provide a means for the rapid production of dry cutting of bearing parts,and the machining efficiency was greatly improved.By using green energysaving design concept,based on camera,accelerometer detection technology of machine tool transmission energy saving device,intelligent energy management system and the latest drive and motor technology,the machine can reduce energy consumption up to 40%.