This type of machine is fashionable in structure and reasonable in design with good performance and high automatic function. It is easy to operate. The principle for purification is physical methods. The filter system is made of high element compound materials. Therefore, the filtering is precision without filter paper. It is no necessary to change the materials in its using term of life. And it is inversely self-washing. It is widely used in multiple purposes, neglecting conditions in the environment and locations. It can purify and regenerate the scattered waste oil. It can be used on-line for regeneration and purification.