Method and device for activating mobile power supply

The invention relates to the filed of power supplies and relates to a method and a device for activating a mobile power supply. The method comprises the following steps of when a circuit between a DC/DC (Direct Current/Direct Current) module in the mobile power supply and a battery protecting circuit is disconnected, detecting whether a switch in an automatically activated circuit is pressed or not by a main controller; if so, generating current in the automatically activated circuit, and conducting the circuit between the DC/DC module and the battery protecting circuit; when the circuit between the DC/DC module and the battery protecting circuit is conducted, detecting the high and low levels of a load by the main controller according to a load identifying circuit to control the DC/DC module to begin output, carrying out AD (Analog-to-Digital) acquisition on the voltage change at the resistor end of the load by a load current-detecting circuit according to the output of the DC/DC module, calculating the current of the load by the main controller according to a received voltage AD signal, and sending the current to be displayed to a display screen. Through the method and the device, the mobile power supply can be activated by only restarting the switch, the continuous output of a battery to the load is adjusted according to the current magnitude of the load, and the current value of the load is displayed.