The invention provides a power cell echelon utilization, screening and grouping method. The method comprises the following steps that (1) ex-service cells are preliminarily screened, the cells with poor appearances are removed, and the cells qualified through preliminary screening are left; (2) parameter values of at least two important parameters of the cells qualified through preliminary screening are acquired, each parameter value deviation of each cell is calculated, the cells with any parameter value deviation unqualified are removed, the cells with each parameter value deviation within the preset range are screened out to be used as alternative cells, and the important parameters comprise the capacity and alternate current internal resistance; and (3) the variation tendency of the direct current internal resistance DCR of the alternative cells along with capacity fading is analyzed, the cells consistent in variation tendency of the direct current internal resistance along with capacity fading are classified into the same level, and pairing and grouping are achieved. Compared with the prior art, according to the power cell echelon utilization, screening and grouping method, cell capacity consistency is guaranteed, meanwhile, consistency of self-discharging and rate capability of the grouped cells can be guaranteed, and the service life of a battery set is greatly prolonged.