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In order to reduce the energy consumption caused by network reconstruction, this paper proposes an extensible WSN energy saving clustering algorithm (AEECA).Firstly, the candidate cluster heads are selected in the whole network according to the residual energy of nodes, and then the common nodes choose the cluster heads they want to join according to the value degree of candidate cluster heads, residual energy, number of neighbor nodes and other factors. When the average residual energy in the cluster is greater than a certain threshold, the head of the cluster shall be rotated in the cluster, and there is no need to re-select the head of the cluster in the whole network. When a new node applies for network access, it calculates the network access permit value according to the surrounding cluster head residual energy, current load, location distribution and other factors, selects the cluster head with the maximum permit value to join, and carries out data transmission through the reserved time slot allocated by the cluster head. Simulation results show that compared with LEACH, EEUC and other classical clustering algorithms, the proposed algorithm can effectively balance the energy consumption of nodes and prolong the life cycle of the network.