The utility model discloses a compact and enclosed gas insulated impulse voltage generating device. The compact and enclosed gas insulated impulse voltage generating device comprises a charging device and a wave modulation device, and also comprises a sealing insulating shell, a frame-type insulating support, a first umbrella insulator, a second umbrella insulator, a fifth umbrella insulator, and a gas insulated multistage impulse voltage generator fixed in the sealing insulating shell via the frame-type insulating support, wherein the sealing insulating shell is equipped with an inflation/defilation port and is grounded. The compact and enclosed gas insulated impulse voltage generating device of the utility model enables the size and weight to be reduced effectively, and can adapt to the on-site test of the extra/ultra high voltage power transformation equipment.