The invention discloses a power battery echelon-use assessment method, and provides an echelon-used battery core screening and assembling method which aims at defects of a current echelon-use judgment method and an assembling use method. The analysis credibility and the used reliability after the assembly is performed can be ensured without expensive instruments and equipment or complicated detection and analysis. The power battery echelon-use assessment method establishes a unique tracing code for each new battery core, calculates an evolution mode of the battery core, forms a bad battery core removal standard, and removes the back battery core. The batteries out of service are assembled and used. An analysis method of the evolution mode of a remote monitoring server and the bad battery core removal standard are corrected. The power battery echelon-use assessment method uses the whole historical data of the battery cores for analysis. Based on evolution predicted consistency, in comparison with state parameter matching groups, a life of an echelon-use battery pack gets maximum play, and the matching group effect, the credibility and the reliability can be continuously raised without expensive matching groups or complicated tests.