An apparatus for preventing over-charge for a vehicle battery includes a switch disposed between an adjacent battery cell and a battery cell and closely contact the battery cells when each of the battery cells swell and to form a contact. An inflator is configured to be exploded when the switch is connected. A cushion configured to be disposed between the adjacent battery cell and the battery cell and swells depending on the explosion of the inflator to cut a lead tab which connects the adjacent battery cell and the battery cell.