A fault processing method based on industry Ethernet network, wherein exchanging devices in the network are connected by mutual redundant double links, wherein work link is in working state, spare link is in spare state, the method comprising: detecting connection states of the double links between the exchanging devices in the network; and switching the spare link to the work link when the work link is in fault state and the spare link is in connection state, wherein the state of the link includes: the link in connection state, the link in fault state or the link in disconnection state; each of the exchanging device includes at least four ports, and connects to an adjacent exchanging device thereof via two ports respectively; two ports of the exchanging device in the same link are ports in the same ring, and two ports of the exchanging device connected to the same exchanging device are ports in the same direction; and wherein the switching the spare link to the work link comprises the following steps: searching, by the exchanging device, a port in the same direction with the fault port which makes the work link in the fault state; and converting the state of the working port in the work link into forbidden state and converting the state of the spare port in the spare link into an original state of the work link when the spare link comprising the port in the same direction is in connection state. detecting connection states of the double links between the exchanging devices in the network; and switching the spare link to the work link when the work link is in fault state and the spare link is in connection state, wherein the state of the link includes: the link in connection state, the link in fault state or the link in disconnection state; each of the exchanging device includes at least four ports, and connects to an adjacent exchanging device thereof via two ports respectively; two ports of the exchanging device in the same link are ports in the same ring, and two ports of the exchanging device connected to the same exchanging device are ports in the same direction; and wherein the link in connection state, the link in fault state or the link in disconnection state; each of the exchanging device includes at least four ports, and connects to an adjacent exchanging device thereof via two ports respectively; two ports of the exchanging device in the same link are ports in the same ring, and two ports of the exchanging device connected to the same exchanging device are ports in the same direction; and wherein the switching the spare link to the work link comprises the following steps: searching, by the exchanging device, a port in the same direction with the fault port which makes the work link in the fault state; and converting the state of the working port in the work link into forbidden state and converting the state of the spare port in the spare link into an original state of the work link when the spare link comprising the port in the same direction is in connection state. searching, by the exchanging device, a port in the same direction with the fault port which makes the work link in the fault state; and converting the state of the working port in the work link into forbidden state and converting the state of the spare port in the spare link into an original state of the work link when the spare link comprising the port in the same direction is in connection state.