The invention provides a current for preventing a start overcurrent of a battery pack. The battery pack is connected with a load via a circuit, and the battery pack supplies power to the load. The load includes an energy storage capacitor. The circuit includes a resistor, wherein one end of the resistor is connected with the battery pack, the other end of the resistor is connected with the load, and the resistor is used to enable a current flowing out of the battery pack in a T period of the start of the battery pack to be less than a preset value; a switch which is connected in parallel at both ends of the resistor, and is in the off state during the T period of the battery pack being turned on, and then is in the on state after the T period of the battery pack is turned on, and the switch is used for enabling the battery pack to directly supply power to the load when the current flowing out of the battery pack is less than the preset value.