At present, ZBR algorithm is widely used in ZigBee network, but after research and analysis, the energy consumption of ZBR algorithm can be greatly reduced. Therefore, an improved hierarchical energy control algorithm is proposed in this study. The improved algorithm limits the spread range of RREQ packets by controlling the energy threshold of nodes, limits the depth of the network, discards unwanted RREQ packets and reduces them. The energy consumption of the network is compared with the original algorithm in terms of end-to-end delay, residual energy and packet delivery rate through NS-2 simulation experiments. The experimental results show that the improved algorithm can ensure the stability of the network transmission, reduce the delay and energy consumption, and maximize the network lifetime.