A harmonic suppression method with multi-mode fuzzy hysteresis control was proposed for the rapid increase problem of grid harmonics in large-rate rapid charging of battery for electromagnetic launch. Based on the timing series topology of the hybrid energy storage system for electromagnetic launch, the special application conditions and largerate charging strategy of the battery were explained. The topology of the battery charging was introduced, and the source, characteristics and causes of the harmonics were clarified. Based on the analysis of the harmonic characteristics of a single charger, the distribution of harmonic voltage and current of the power grid under different charging currents and the number of chargers were studied. The multi-mode control method and its switching criteria were designed. The simulation model of the charger, instantaneous reactive power detection, harmonic suppression and multi-mode control were established. Simulation and experimental data show that the multi-mode control method can quickly suppress the harmonic abrupt increase of the large-scale start, stop and fluctuation of the chargers, and the compensation effect satisfies the national standards.