A high-performance servo drive strategy based on the collaborative control of PLC and frequency converter isproposed to address the contradiction between high cost of traditional servo systems and low accuracy of variable frequencyspeed regulation systems. The system uses Siemens S7-1200 PLC as the main control unit，establishes real-time communication with G120 frequency converter through PROFIBUS-DP bus，and constructs a "position-speed-torque" three loop cascadecontrol architecture. The fuzzy PID parameter self-tuning algorithm is introduced to achieve online optimization of controlparameters，designing acceleration feedforward，friction compensation，and expanded state observer to synergistically suppressdisturbances. Experimental verification shows that the positioning accuracy of the system reaches ±0.018 mm，the response time is shortened to 80 ms，and the speed fluctuation rate is controlled within 0.5%. Compared with traditional solutions，its performance is improved by 67%，45%，and 60% respectively，effectively solving the technical contradiction between high accuracy and low cost.