There is an inherent modeling uncertainty and also poor dynamic performance of islanded photovoltaic parallel inverter systems. Thus a fixed-time fuzzy backstepping control strategy is proposed. First, the filter parameters and output current are regarded as unknown terms, and the equivalent mathematical model of a single inverter with filter parameter perturbation and output current disturbance is established. Second, the fixed-time Lyapunov stability principle, fuzzy logic and backstepping control theories are combined, and the fixed-time fuzzy backstepping controller is used to approximate the unknown terms in the system to improve the output voltage of the inverter. Then, based on the strict Lyapunov theorem, the system is proved to be fixed-time stable with the proposed control strategy, and the upper bound of the stable time is independent of the initial state of the system. Finally, the effectiveness of the proposed control strategy is verified by two prototypes of 20 kW parallel inverters.