An apparatus of controlling charging of a vehicle battery may include a charging device of a vehicle, the charging device configured to generate a boosted voltage higher than a charging voltage of electric vehicle supply equipment provided outside the vehicle and to charge a battery storing power for driving the vehicle, and a vehicle control unit configured to determine whether power line communication transmitting information for charging the battery performed with the electric vehicle supply equipment provided outside the vehicle and providing the charging voltage to the charging device of the vehicle is off while the battery is charged by the boosted voltage.