The present invention discloses a lamp device, which comprises a base, a lamp seat installed in the base and electrically connected with a circuit board, at least one USB interface, and a lamp shade hooding the lamp seat thereinside. The USB interface includes a cartridge disposed in the base and a USB socket module disposed inside the cartridge. The USB socket module is separated from the circuit board and electrically connected with the circuit board through cables. A wall of the cartridge has at least one opening. The interface of an external USB data line can be passed through the opening and inserted into the socket of the USB socket module. The USB interface is reduced to a smaller size and requires less space for installation. Therefore, the position for installing the USB interface has higher selectivity, and the overall esthetics of the base is improved.