The rotary table drive device is an important part in the drilling rig to achieve power transmission and distribution, change the direction of power transmission, and be used to rotate the drilling tool. The rotary table drive device is a chain transmission device, which is mainly composed of angle transmission case, chain case, coupling, rotary table( prepared by the user), lubrication system and other unit components. The rotary table drive device has two gears , which can meet the needs of different working conditions and improve the drilling efficiency. The chain box is sunk under the drilling floor, and the drilling floor is flat, open and convenient for operation. With universal joint shaft connection, no stricet calibration is required during installation.