The robot bearing is a crossed roller bearing structure. According to its application, it is divided into two categories: the outer ring split, the inner ring as a whole, and the outer ring and the inner ring as a whole. The rolling elements are cylindrical rollers, which are arranged in the V-shaped raceway at 90 degrees to each other. This structure enables a single bearing to bear loads in various aspects such as axial load, radial load and overturning moment at the same time. The bearing has high rigidity, rotation accuracy and composite bearing capacity. Installation holes are convenient for customers to install directly, suitable for various types of robots.