The invention discloses a method and system for evaluating health status of a cascade utilization battery energy storage system. The method for evaluating the health status of the cascade utilizationbattery energy storage system comprises the steps that charging and discharging experiments are carried out on a selected cascade utilization battery to obtain battery status parameter data; correlation between the battery status parameter data and battery health status is analyzed, and a correlative correlation coefficient between the battery status parameter data and the battery health status isdetermined; a health factor affecting the health status of the battery is determined according to the correlation coefficient; and the health status of the cascade utilization battery is evaluated through the health factor.