In order to solve the problems of environmental pollution and resource shortage, our government strongly supports the development of the new energy vehicle industry. With the increase of the number of electric vehicles, how to recycle the retired batteries for automobile has become a key issue for the development of the industry. The safety of cascaded utilization of retired batteries was considered from the aspects of domestic and foreign policy analysis and safety analysis of the cascaded utilization process. Cascaded utilization includes decommissioned batteries collection and disassembly, screening, recombination, application, etc., focusing on screening and recombination, combined with the health status of decommissioned batteries and the state evaluation of the remaining capacity, consistency sorting safety analysis. At the same time, the problem of poor battery consistency was improved according to the existing recombination technology, and the safety of the recombination system was evaluated. On the basis of the above analysis, the hidden safety risks in each link of the phased utilization of retired batteries are presented, and the corresponding management policies are proposed to guarantee the safety of the cascaded utilization of batteries, which provides a reference for the future development of the cascaded utilization system of retired batteries.