The utility model relates to a high-voltage pulse generator, in particular to a bipolar nanosecond high-voltage narrow-pulse generator, which solves the problems of large inductance, serous oscillation, high trailing voltage and unstable peak value of a bipolar high-voltage pulse power supply work loop in the prior art. The utility model has the technical scheme that the bipolar nanosecond high-voltage narrow-pulse generator comprises a direct current high-voltage circuit module, a synchronous triggering control circuit module, a positive pulse forming circuit module, a negative pulse forming circuit module and a high-voltage pulse synthesis circuit module. The bipolar nanosecond high-voltage narrow-pulse generator is applied to high-voltage narrow-pulse power supply design circuits in the fields of desulfuration and denitration, volatile organic chemicals (VOCs) removal, material surface modification and the like.