Aiming at the security communication problem of Heterogeneous Sensor Network (HSN), a secure group key management scheme W-LKH++ was proposed based on LKH++ tree. Firstly, as the wireless sensor nodes with low configuration, the initialization method for group key of LKH++ tree was modified to reduce the computationol overhead on each sensor node. Then, the holding way of keys were improved to reduce the storage overhead on each sensor node. Finally, a dynamic key updating method suitable for cluster head nodes was proposed to enhance the ability against node capture of the cluster head nodes based on low communication overhead, improving the security of communication of Wireless Sensor Network (WSN). Performance analysis and simulation results show that W-LKH++ improves the WSN security with low computation, storage and communication overhead.