The bearing of turntable is the same as the common bearing, which has rings and rolling elements, but it is quite different from the common bearing. The size of turntable bearing is generally large, its diameter is usually 0.4-10 meters, some of which even reach 40 meters. In general, the bearing of rotary table works under the condition of low speed and heavy load. The bearing of rotary table has its own mounting hole, lubricating oil hole and sealing device, which has the characteristics of compact structure, convenient guide rotation, simple installation and easy maintenance. This topic mainly introduces the main structure type, code method, technical requirements, design and processing, measurement technology and other aspects of the rotary table bearing.