A mobile power supply includes a case, a control circuit board, a power storage module, a heating element and a thermal sheet. The case is with a hole formed thereon. The control circuit board is disposed in the case. A plurality of electrical connectors is welded on the control circuit board and is exposed by the case. The power storage module is disposed in the case and electrically connected to the control circuit board. The heating element is disposed on the case and exposed at the hole. The heating element is electrically connected to the control circuit board. The thermal sheet is attached to the case and in contact with the heating element. Thereby, the mobile power supply may provide heat and be used for heat preservation or for keeping warm.