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Generally, the controller designed by the fuzzy control algorithm is targeted to realize the MPPT control of the photovoltaic system. When the PV system or controller parameters change, there will be problems such as slow tracking speed, poor stability, and even tracking failure. In view of this, an MPPT algorithm based on variable universe fuzzy control is adopted in this paper. The fuzzy rule of controller is designed by using the tracking principle of conductance increment method to improve the universality of the controller. In addition, the algorithm introduces a scaling factor to implement the design of the variable universe to reduce the impact of changes in controller parameters on the tracking effect. The simulation model is built in MATLAB/Simulink, and the feasibility of the algorithm is verified. The simulation results show that the algorithm is nearly doubled in tracking speed compared with the conductance increment method. The simulation results show that the variable-domain fuzzy control method is nearly doubled in tracking speed compared with the conductance increment method. Besides, under the mismatch of the domain mismatch and the PV system model, the new method can better realize the MPPT control of the photovoltaic system compared with the conventional fuzzy control. [ABSTRACT FROM AUTHOR]