In order to reduce the labor intensity and saving labor time, and change the existing dicing is not smooth and high crushing rate characteristics, thus we developed a high degree of automation frozen fish cutting machine. Frozen fish cutting machine functional requirements analysis, design of frequency control. Using UUS (Universal Serial Interface) communication protocol to realize the communication between SIEMENS PLC and MM440 inverter, adjust the fish cut width by 57BYGH1.8 degrees of ordinary gear reducer motor, precise ranging using SW-LD50A ranging sensors, using photoelectric counter for piece count, using the PLC program writing to control frequency converter parameters, and set the running parameters of the deceleration motor. Through the serial communication between the PLC and the host computer, a good human-computer interaction interface is realized, thus complete the automatic control of frozen fish cutting machine. The performance test shown that, under the condition of rated voltage 400V, the cutting speed can be in 25 n/min-35 n/min for debugging, the width was 600*400*80mm of the miscellaneous fish plate, the cutting width can be adjusted within the 60mm-90mm, the no-load state, the power of the size of 0.26kW, the load running speed, power, torque proportional relationship. Under the specified width, the precision cutting machine cuts in±5%and accurate statistics the number of slices. The system is reliable and suitable for the application in coastal fishery.