A network device including a power receiving socket, a power supply, a network controller, plural connection ports and a power outputting socket is provided. The power receiving socket is for receiving an external power and outputting a supply power. The power supply is electrically connected with the power receiving socket for receiving the supply power, wherein the power supply has the received supply power rectified and voltage-reduced, then outputs a direct current power. The network controller operates according to direct current power. The plural connection ports respectively are respectively electrically connected with the network controller. The power outputting sockets is electrically connected with the power receiving socket for receiving and outputting the supply power.