Vehicle flow monitoring method and system and vehicle

The invention relates to the technical field of vehicles, in particular to a whole vehicle flow monitoring method and system and a vehicle. The vehicle flow monitoring method comprises the steps that a diagnosis link connector sends a first control instruction to a central gateway through a vehicle-mounted diagnosis system interface; the central gateway sends all messages received and sent by a plurality of message receiving and sending ports to the diagnosis link connector according to the first control instruction; and the diagnosis link connector analyzes all the received messages to obtain a whole vehicle flow analysis result. The first control instruction is sent to the central gateway through the diagnosis link connector, the central gateway is controlled to send all messages received and sent by the plurality of message receiving and sending ports to the diagnosis link connector for message analysis, and the whole vehicle flow analysis result is obtained, so that the network flow of the central network