Aiming at the problems of low control accuracy and large temperature fluctuation in the current cooling water temperature control system of diamond press using traditional PID algorithm,a control method of combining the improved whale algorithm with the neural network PID control algorithm was proposed to realize the adaptive adjustment of PID parameters.Taking GD32 single-chip as the core and the stepper motor as the actuator,the hardware controller of the circulating cooling water temperature control system was designed to control the opening of the flow regulating valve and realize the temperature control.The simulation and experimental results show that compared with the traditional PID algorithm,the temperature control system can control the water temperature with smaller overshoot,higher control accuracy and the control effect is greatly improved.