CAN repeater

The invention discloses a kind of CAN repeater aimed at providing the CAN repeater with the heightening of its communication range and nodal points. The main points of its technological plan include 2 CAN transceiver, 2 photoelectric shield separators (retainers) and 2 terminal photoelectric resistant devices. The transmitter data of input terminal of the said CAN transceiver after being photo-electrically isolated through one of the said photoelectric terminal shield retaining is connected with the receiving data output of another CAN transceiver. The receiving data output terminal of the said CAN transceiver, after being photo-electrically separated through another of the said photoelectric shield retainers is connected with the transmitting data input terminal of another CAN transceiver; the said 2 CAN transceivers are connected respectively with 2 CAN networks through their CANL terminal and CANH terminal; the said 2 terminal electric resistant devices are installed respectively between CANL terminal and CANH of the said 2 CAN transceiver for the general line matching impendence on each CAN general line.