Vehicle ECU diagnosis routing table updating method and system

The invention discloses a vehicle ECU diagnosis routing table updating method and system, and the method is implemented based on a vehicle-mounted Ethernet, and the method comprises the steps: if a vehicle ECU newly connected to a certain local area network of the vehicle-mounted Ethernet does not register a diagnosis routing table, broadcasting a registration address discovery service message to the local area network based on a SomeIP protocol; the discovery registration address service message is used for notifying the gateway to provide a registration address service; the vehicle ECU receives a registration address service providing message sent by the gateway and sends a registration address service request message to the gateway, and the registration address service request message carries a logic address of the vehicle ECU; and the vehicle ECU receives a registration address service response message sent by the gateway, the registration address service response message being used for indicating that th