Abstract: This paper analyzes the dynamic balance detection theory of high-speed NC rotary table and expounds the dynamic balance evaluation standard. The selection scheme of dynamic balance detection hardware for high-speed NC turntable is proposed. The adjustment method of dynamic balance of high-speed NC rotary table is described in detail. Combined with an example, the dynamic balance adjustment scheme is verified. Through this research, the vibration caused by dynamic unbalance of high-speed NC rotary table can be reduced, and then the machining accuracy and service life of the machine tool can be improved.