Aiming at the demand for intelligent transformation and upgrading of traditional cutting manufacturing units, a solution for intelligent manufacturing cutting processing system with Siemens S71200 PLC as the control core was proposed. Through industrial ethernet, PLC and machine tools, manufacturing execution system（MES）, robots, RFID were integrated organically. The connection relationships between PLC and each component were analyzed emphatically. The task flows issued by the MES system were processed by PLC, and the intelligent processing of the processing process was achieved. This system has positive significance in accelerating the intelligent transformation of processing units and improving efficiency.