Multi-purpose mobile power supply

The utility model discloses a multi-purpose mobile power supply comprising a surface shell and a bottom shell, wherein a circuit board and a plurality of lithium batteries are arranged between the surface shell and the bottom shell, a DC (direct-current) charging jack and a USB (universal serial bus) port are sequentially arranged on the circuit board, the circuit board is also provided with a high-brightness LED (light-emitting diode) lamp and a plurality of gear switches, in the way, besides charging digital products, the mobile power supply can be used as an electric torch by switching on the high-brightness LED lamp, the output voltage can be adjusted by the gear switches in a three-section manner so as to be adaptive to different digital devices.