A charging device applied to a portable mobile communication device is disclosed in the present invention. The charging device includes a base, a supporter and a transmission module. The supporter and the transmission module are disposed on the base in a detachable manner. The transmission module includes a first connector, a second connector and a transmission cable. The first connector is disposed on an opening on the supporter for electrically connecting to a terminal of the portable mobile communication device. The second connector disposed inside an accommodating structure of the base for electrically connecting to an external electronic device. Two ends of the transmission cable are respectively connected to the first connector and the second connector, so that the external electronic device and the portable mobile communication device can transmit electric power via the transmission module.