Abstract: Herein disclosed in a vacuum oil purification system which includes a fresh oil vacuum chamber, an old oil vacuum chamber for degasifying and dehumidifying insulating oil, a vacuum pump for generating vacuum environment, an oil pump for circulating oil, an oil filter for removing particles from oil, a pressure vessel for generating and adjusting oil pressure, heaters, heat, pressure and vacuum sensors, an oil penetration tray, a control panel having all the control buttons, LEDs, and quick connects, a mobile platform to hold all components in place, and an oil pan to collect all oil drips. A control unit with an LCD supervises all the input signals from sensors and generates command signals. The fresh oil vacuum chamber is covered by a foam and foil wrap insulation for heat exchange separation. This insulation cover dampens sound and vibration as well. The chambers have oil drain valves at the bottom.