According to fieldwork requirement, this machine equips the car tires, ZYM vacuum dielectric oil purification dehydration machine is mounted on trailer and move to any work point by traction. It is special suitable for on-line purification of the transformer oil. The transformer oil purified by this oil filtration machine can reuse again in transformers. This oil purification machine also can install the recondition system to remove acidity, sludge, free carbon, other soluble oil decay products and discoloration. ZYM dielectric oil purification dehydration machine mainly has the functions of degassing, dehydration and filtering impurities of transformer oil.