Solely designed for lubricating oil is made according to nature of high impurity of lubricating oil including hydraulic oil and mechanical oil, which has features of short time for treatment and high efficiency, enabling fast removal of oil's water, gas, impurity and volatiles such as alcohol, gasoline and ammonia gas. Hence the quality of oil is improved, viscosity of lubricating oil, flash point and other performances are recovered which ensures a correct running of hydraulic system, power system and lubricating system. It is especially suitable for industries including petroleum, chemical, mine, metallurgy, power, traffic, mechanical manufacture and railway for the recovery and purification of various lubricating oil such as hydraulic oil, mechanical oil, cooling oil, refrigerating oil, gear oil, gasoline engine oil, diesel oil and heat treatment oil.