Our food waste biogas fermentation process designs biogas fermentation automatic control system based on the SIEMENS 37-300PLC and ForceControl V7.0. As the PLC has good stability, strong anti-interference ability and reliability it is very suitable for the control site but it does not have a good man-machine interface;Since the industrial configuration software has high flexibility and convenience but poor anti-interference ability [3]. Using a combination of methods with the PLC and industrial configuration, we designed a subordinate unit master-slave structure. Each part functions as follows: