The cross roller bearing is a special type of bearing with a divided inner ring and a rotating outer ring. Because the divided inner ring or outer ring is fixed together with the cross roller shaft ring after the roller and the spacer are installed to prevent separation from each other, the installation of the cross roller shaft ring is simple. Since the rollers are arranged crosswise, only one set of cross roller rings can bear loads in all directions, and the rigidity is increased by 3-4 times compared with traditional models. At the same time, because the inner ring or outer ring of the cross roller bearing is a two-part structure, the bearing clearance can be adjusted, and even if preloaded, high-precision rotation can be obtained.