A system and method for supplying power to an Anti-lock Braking System (ABS) for a vehicle includes: determining whether an ignition key has been turned on; comparing voltage of a first battery unit, configured to apply the power to an ABS actuation unit, with voltage of a second battery unit, connected to the first battery unit, if the ignition key has been turned on; determining whether the ABS actuation unit is operating if the voltage of the first battery unit is lower than the voltage of the second battery unit; and charging the first battery unit with the power if the ABS actuation unit is operating, and balancing the voltage of the first battery unit and the voltage of the second battery unit if the ABS actuation unit is not operating.