The invention discloses an electric vehicle charger. The electric vehicle charger comprises a power supply grid which is connected with an electric vehicle through a charger. An energy storage unit isconnected between the power supply grid and the charger. The energy storage unit is controlled by a control unit. The energy storage unit is connected in parallel to the existing DC charging system.When the grid is powered off, the electric energy of the energy storage unit is input to the DC charging system so as to realize uninterruptible power supply to an electric vehicle charging system. When the grid operates normally, the electric energy is directly input to the DC charging system through a bypass circuit, and when there is not enough electric energy in the energy storage unit, the control unit emits a signal to close the switch at the input end of the energy storage unit to charge the energy storage unit.