The invention discloses a wireless sensor network downlink message energy-saving flooding method based on sleep scheduling. The method comprises the following steps: step 1, an initialization phase: anode obtains neighbor node information through mutual message transmission between neighbors, and obtains system configuration parameters; 2, arranging the acquired neighbor node information and system configuration parameters into a known parameter information base to realize the sharing of nodes in the network; Step 3, layering the sensor network by taking the hop count of the node as a standard, and calculating the coverage of each node; 4, selecting an MPR node according to the principle that the coverage degree is the widest, and selecting the MPR node according to the principle that the residual energy is preferential to ensure that the next layer of nodes is completely covered to generate an MPR node set of each layer; And step 5, implementing a layered sleep wake-up mechanism. According to the method, the number of transmission packets in the network can be effectively reduced, network congestion is avoided, time delay and extra energy cost are reduced, and the lifetime of the sensor network is effectively prolonged.