The invention discloses an SOC adaptive correcting method for a secondarily utilized battery. The SOC adaptive correcting method for the secondarily utilized battery comprises the following steps: 1)acquiring battery running data in a specific voltage range; 2) analyzing the battery running data, calculating available capacity Ca of a battery under discharging rate current Ia by using an ampere-hour integral method, and calculating equivalent available capacity C'a of the battery under standard current I0 according to a current-capacity curve of the battery; 3) calculating attenuation changerate of the available capacity of the battery, if the attenuation change rate is in a normal range, updating the available capacity C'0=C'a of the battery under the standard current I0, not updating the available capacity C'0=C'a of the battery if the attenuation change rate exceeds the normal range, and reporting abnormity and alarming; and 4) calculating a SOC correcting coefficient k by using the available capacity C'0 of the battery under the standard current I0 and initial available capacity, and updating the SOC correcting coefficient of the battery. The accuracy of SOC estimation of thebattery is improved.