The utility model provides a simulation insulation medium defect test device and an electric field applying device. The simulation insulation medium defect test device comprises a first power supply,a gas chromatograph, the electric field applying device, a heating device and a partial discharge monitor, wherein the first power supply is electrically connected with the power-up field device, andthe partial discharge monitor is electrically connected with the power-up field device; wherein the electric field applying device generates an electric field for a to-be-measured insulating medium arranged in the electric field applying device, and the heating device is used for heating the electric field applying device and providing a preset temperature for the to-be-measured insulating medium;the partial discharge monitor is electrically connected with the electric field adding device and is used for monitoring the partial discharge amount of the insulating medium to be detected; and thegas chromatograph is used for carrying out oil chromatographic analysis on the transformer oil in the electric field applying device. The device provided by the utility model can simulate the defectsof the insulating medium under different conditions, a platform is provided for the deep research of the insulating characteristics of the insulating medium, the research result can guide the selection and treatment process of the insulating medium, and the safety and economy are improved.