Clamping-type detachable mobile phone back-up power supply

The invention provides a clamping-type detachable mobile phone back-up power supply, which comprises a battery charging module fittedly fixed on a protective sleeve by a clamping device; the battery charging module comprises a bottom cap, a separation board fittedly fixed on the bottom cap, a circuit mainboard, and a battery connected with the circuit mainboard; a cavity for accommodating the battery and the circuit mainboard is disposed on the bottom cap; the separation board is disposed above the circuit mainboard and the battery; a terminal matched with the mobile phone is disposed on the circuit mainboard; a terminal cap fixed on the separation board is disposed above the terminal. The protective sleeve is fixed on the bottom cap accommodating the battery in a clamping manner, and the power supply is connected with the mobile phone through the terminal matched with the mobile phone; on one hand, the mobile phone can be charged by the power supply so as to prolong the standby or using time of the mobile phone; no connecting line is required when in use, which is convenient for users to use; the structure is compact, which is convenient for users to carry; on the other hand, the protective sleeve can be detached from the bottom cap, which meets individualized selection of protective sleeve colors by users.