The utility model provides a device used for a partial discharge characteristic test. An insulating oil and/or oilpaper insulating material is arranged in the device to test a partial discharge characteristic, and the device comprises a concentric positioning nut, an outer cover and a pedestal. The concentric positioning nut and the pedestal are arranged at the upper and lower ends of the outer cover respectively and form an enclosed cavity, and the centers of the concentric positioning nut and the pedestal are equipped with central through holes respectively and vertically. A high voltage guide rod and a grounding guide rod are arranged in the central through holes of the concentric positioning nut and the pedestal respectively, and the end parts of the high voltage guide rod and the grounding guide rod which are located in the enclosed cavity are equipped with an upper electrode and a lower electrode respectively. The improvement of the utility model is that the concentric positioning nut is equipped with a through hole parallel with the central through hole thereof, a connecting rod is arranged in the through hole, and the end part of the connecting rod located in the enclosed cavity is equipped with a supporting ring horizontally. Compared with the prior art, the device used for the partial discharge characteristic test provided by the utility model is simple in structure and good in test effect, and is easy to disassemble.