A charging device (1) for a camera flash includes a digital signal processor (10) providing a pulse width modulation signal and receiving a feedback signal, a voltage boosting circuit (20) electrically connected with the digital signal processor for outputting an induced current under the control of the pulse width modulation signal, a flash capacitor (40), and a charging circuit (30) electrically connected with the voltage boosting circuit and the flash capacitor for charging the flash capacitor by the induced current. The charging circuit includes a protection circuit (310) for protecting the flash capacitor and a feedback circuit (320) for outputting the feedback signal to the digital signal processor.