Provided are system and method for correcting a state-of-charging (SOC) of a battery. The system for correcting the SOC of the battery includes an SOC measuring unit measuring an SOC value of the battery, a storage unit storing preset operation ranges to determine whether charging/discharging of the battery is compensated, a determining unit determining an operation range corresponding to the SOC value of the battery among the preset operation ranges, and an SOC correcting unit adjusting a dead band in charging/discharging directions or charging/discharging power according to the result determined in the determining unit to correct the SOC value of the battery. The method for correcting the SOC of the battery includes measuring an SOC value of the battery, comparing the SOC value to preset operation ranges to determine an operation range corresponding to the SOC value, and adjusting a dead band in charging/discharging directions or charging/discharging power according to conditions corresponding to the operation range which corresponds to the SOC value to correct the SOC value of the battery.