Aiming at the present situation of using artificial template comparison to judge the dimensions of steel tower components,and according to the punching process of the steel tower components,the detection and control system for the steel tower components in steel joint production line was designed.By analyzing the principle of punching process of steel tower components,the overall structure of the control system was determined.The diagram of software system was given,and the program of control unit and serial port communication was written.The control system was tested and analyzed.The results show that the designed control system can accomplish the automatic collection and alarm of the dimension detection of steel tower components when they do not match.So the workload of workers is greatly reduced and it is convenient to cooperate with the detection system of steel tower components,which has certain reference value for promoting enterprises to realize the automatic acquisition detection of steel tower components.