Abstract: A manually chargeable flash light comprises a casing, a lamp, and a power system, wherein the lamp is at least an LED (Light Emitting Diode), and the power system is composed of a gear set mechanism, a mini power generator, and an accumulator. The gear set mechanism is connected with a handle, which is connected with a handle arm outside the casing. Comparing to the current techniques, the present invention uses a manually driven power source to replace the conventional battery power, thereby guaranteeing power supply at any time without exchanging batteries. Therefore, the troublesome of depleting batteries without backup can be avoided, and energy can be saved due to the high efficiency of LED. Furthermore, it will not cause the pollution to the environment by waste batteries.