The invention discloses a network power supply electric control system comprising a sending end coupling circuit and a receiving end coupling circuit, and the sending end coupling circuit comprises a band pass filtering circuit 1 and a voltage transformer circuit 1; the receiving end coupling circuit comprises a band pass filtering circuit 2, a voltage transformer circuit 2 and a transistor amplification circuit. Via the network power supply electric control system, two different systems of a computer network and notebook computer electric power are combined, electric power and network access can be simultaneously supplied to a notebook computer via a network cable, large power local area network power supply can be realized, a stable direct current power source can be provided for large power equipment such as the notebook computer and the like, and the system disclosed in the invention is wide in voltage range and application scope.