In power industry, insulating oil is used as cooling and insulation media. Keeping the natural property is very important to make the electric equipment work safely and well, the cooling and insulation capacity will reduce after using or storing for a long time, so we should use vacuum insulating oil purifier to recover its property. The moisture, gas and impurities can be easily dissolved in insulating oil during usage or storage, that will effect insulation capacity. The vacuum insulating oil purifier utilizes high capacity vacuum pump as vacuum source, which can remove the moisture and gas quickly. Meanwhile, the insulating oil purifier equipment high precise filter elements to remove impurities.