Workbench exchange device for horizontal numerical control machine tool

The invention provides a workbench exchange device for a horizontal numerical control machine tool. The workbench exchange device comprises a base, a servo motor, an anti-backlash transmission mechanism, a rotary lifting mechanism, and a rotary arm assembly, wherein the anti-backlash transmission mechanism is used for realizing high-precision rotation and has a large reduction ratio, the anti-backlash transmission mechanism is connected with the servo motor, the rotary lifting mechanism is arranged on the base, the rotary arm assembly is used for bearing a workbench, the servo motor is used for driving the anti-backlash transmission mechanism, and the anti-backlash transmission mechanism is connected with the rotary arm assembly, so that the rotary arm assembly rotates within an angle range of +/- 180 degrees, and the rotary arm assembly is associated with the rotary lifting mechanism so that the rotary arm assembly can be driven by the rotary lifting mechanism to ascend and descend. The purpose of the workbe