Abstract: In order to ensure the production continuity and product quality of steel plants, a study on self-tuning PID fuzzy control of power generation units in isolated grid mode is proposed. By building a model of the speed control system of the steel plant generator set in isolated grid mode, real-time monitoring of the operating status of the generator set is carried out. Based on this model, carry out the design work of self-tuning PID fuzzy controller. By using fuzzy reasoning to calculate the adjustment values of PID parameters, the adjusted PID parameters are applied to the controller to achieve precise control of the generator set. The experimental results show that under the isolated grid mode, the self-tuning PID fuzzy control method of the steel plant generator set achieves precise control and dynamic adjustment of the generator set through the combination of fuzzy control and PID control, significantly improving the control performance and response speed of the system.