Waste mineral oil refining method

The invention relates to the technical field of refining processes, in particular to a waste mineral oil refining method. Comprising the following steps: heating the waste mineral oil containing impurities and water to 80-90 DEG C, continuously and circularly passing through a membrane assembly taking a membrane as a contact medium, and continuously pumping waste mineral oil steam penetrating through the membrane assembly into a waste mineral oil collector adopting ice water on the other side of the membrane assembly by using a vacuum pump; and continuously operating for 1-2 hours, taking out the waste mineral oil collector, standing for 5-10 minutes at normal temperature, recovering the waste mineral oil solution, and carrying out steam stripping and reduced pressure distillation concentration on the obtained waste mineral oil solution to obtain the recovered base oil. The waste mineral oil refining method provided by the invention is simple in process, and through a method of simultaneously combining a perv