The invention discloses a dividing system and a dividing device. The system comprises a plurality of dividing groups, wherein each dividing group comprises a network cable and two identical dividing devices; each dividing device comprises a dividing interface and a bus interface; the dividing interface comprises at least one of a computer dividing interface and a telephone dividing interface; the bus interface is connected with the computer dividing interface through four core wires; the bus interface is connected with the telephone dividing interface through two core wires. When line division is performed through the embodiment of the invention, only two identical dividing devices are required to be selected according to the division requirements, the bus interfaces of the dividing devices are inserted into the two ends of the network cable respectively, the dividing interface of one dividing device is inserted into a distribution cabinet and/or a switch of a machine room, and correspondingly, the dividing interface of the other dividing device is inserted into a computer and/or a telephone; the insertion operation is time-saving and labor-saving, the system and the device have no technical requirements on operation personnel, and the conventional technical problems are solved.