jl portable oil purifier equipped with three-stage filtration, easy to operate, very low cost, no need of filtration paper, and no contamination to the ground. the product can effectively purify the tiny mechanical impurity in oil, enabling it to be a prior choice of power industry, the petrochemical industry, metallurgy, mechanics and railway for oil filling, oil drawing and high precise impurity removal of mutual inductor, lathe, and oil breaker which do not use large quantity of oil.