The oil extracted from various organic solid wastes using pyrolysis equipment is heavy oil and crude oil, which are mainly used for heating boilers, with limited application scope and low economic value. In addition, there is still a large amount of waste engine oil, because it contains impurities such as moisture and metal chips that are difficult to reuse. The waste oil is heated by distillation equipment to gasify the oil components, then the oil and gas are cooled to liquefy. After purification, light components such as diesel and gasoline can be obtained; the waste oil can be reduced or generated into lubricating oil, effectively Improved the market value and scope of use of oil products. Impurities and water form residual oil, which can be used for heating in distillation equipment.