Aiming at the problem of poor hole position accuracy and low efficiency caused by manual drilling during the drilling process of composite material inner cavity,a set of fiveaxis linkage machine tool closedloop control system was designed.In the design process of the system hardware and software,the processing stability,reliability and accuracy were fully considered.Combined with the workpiece machining position and the machine structure,the NC system was used as the control core,the automatic compensation positioning error under closedloop control was realized and the machining accuracy was ensured under the joint action of the PCend precision compensation system,NC position command and servo control system.The positioning accuracy of the drilling process was verified through experiments.The results show that the drilling quality and machining efficiency meet the requirements of composite material inner cavity drilling,and the system has certain practical application value.