Based on the environmental problems caused by improper treatment of waste lubricating oil， the regeneration of waste lubricating oil can not only solve the environmental problems， but also alleviate the energy crisis to a certain extent. By analyzing the resource and composition of waste lubricating oil and comparing the advantages and disadvantages of the existing waste oil regeneration technologies， it is found that only by using efficient solvent extraction， severe hydrogenation or comprehensive use of fuming sulfuric acid treatment，can the nonideal components in waste oil be completely removed. However， only by increasing the severity of hydrotreating， is it difficult to achieve this goal with a single catalyst. The combined hydrogenation regeneration process is the best choice. Firstly， the impurities in waste oil can be removed by hydrotreating protection catalyst to ensure the long-term operation of the unit. Secondly， the quality of regenerated oil can be improved by hydroisomerization catalyst. Finally， the stability of final product can be ensured by hydrofining catalyst. In conclusion， the formation of multiple catalysts in parallel or series hydrogenation regeneration process can significantly improve the regeneration yield and product quality of waste lubricating oil， and improve the stability of waste oil regeneration process unit， which is the development trend of waste oil recycling technology in the future.