Train Ethernet backbone network line fault diagnosis method, system and equipment

The invention discloses a train Ethernet backbone network line fault diagnosis method, system and equipment, the method comprises the following steps: acquiring a first communication state between ETBNs directly connected in an end compartment of a train and an equipment state of the ETBNs in the end compartment; determining a first line state between the directly connected ETBNs according to the first communication state and the equipment state; acquiring a second communication state between the ETBNs which are indirectly connected between the carriages at the two ends of the train; According to the second communication state and the equipment state, determining a second line state between the indirectly connected ETBNs so as to position a fault section in the backbone network according to the first line state and the second line state when the train has a backbone network line fault. Therefore, the fault section in the backbone network can be positioned, and reliable operation of the train is facilitated. 本