At present, the application of cross roller bearings in CNC vertical lathe is still a small proportion. Most of CNC vertical lathe spindle structure applications still use the traditional structure, that is Double Row Cylindrical Roller Bearing and plane bearing combination. Compared with traditional structure applications, cross roller bearings have great advantages, which not only satisfy the requirements of traditional spindle structure applications, but also play an important role in optimizing the spindle structure of CNC vertical lathe.