The invention provides a dual-purpose flash disk, which comprises a shell, a flash disk module, a cigarette light-up unit, a power module and a USB connector. The power module and the flash disk module are both arranged in the shell and electrically connected with the USB connector. The cigarette light-up unit is arranged in the shell and electrically connected with the power module. The USB connector is fixedly arranged on the shell. The dual-purpose flash disk realizes a multi-purpose function to bring convenience to users by integration of a cigarette lighter and a flash disk, and materialsand space resources are saved. In addition, the dual-purpose flash disk has advantages of simple structure, high practicality, energy saving and environmental friendliness.