Automatic relay route method

The invention discloses an automatic relay route method, which is characterized in that when a master node distributes flooding packets to a target node, when the flooding packets pass through an intermediate node, the intermediate node judges whether relay conditions are met in accordance with the number of retransmission times of the flooding packets and received signal strength (RSS); if the relay conditions are met, the intermediate node updates the route information of the flooding packets in accordance with self-node identifications and continues to forward the flooding packets; and thetarget node sends response to the master node in accordance with the route information in the received flooding packets. The technical scheme provided by the invention is used for solving the problems that fierce competition happens among nodes participating in the relay, signals collide seriously, and the path finding efficiency is low when the flooding is taken as a path finding mode for downlink and uplink returns in accordance with a reverse path in an automatic relay model in the prior art.