Abstract: In this paper,the entropy weight method is used to calculate the weight of each characteristic parameter of the retired battery firstly. According to the calculation result,the remaining capacity,open circuit voltage and discharge DC equivalent internal resistance of the battery are selected as the sorting factors of battery clustering. Secondly,the support vector machine algorithm is used to predict the remaining capacity of the retired battery. Finally,the K-means clustering algorithm is used to divide the battery into four levels,and the accuracy of the method is proved through experiments.