Charging device

The invention relates to a charging device which comprises a fully-enclosed housing, a circuit board assembly and a heat dissipation plate, wherein the circuit board assembly comprises a circuit boardand a key heating electronic element which is fixedly welded on the back surface of the circuit board; an opening is formed in the inner wall of the housing, and a containing cavity for containing the heat dissipation plate can be fixedly arranged on the inner wall of the housing; grating holes are further formed in the inner wall of the housing where the containing cavity is located, and a sealing piece is further arranged between the containing cavity and the heat dissipation plate; the key heating electronic element is in contact with the heat dissipation plate to transmit heat to the heatdissipation plate, and the heat dissipation plate transmits the heat to the outside through the grating holes. Different from the fan heat dissipation of the existing charger, the charging device disclosed by the invention is