In order to balance the energy-consumption of nodes of the wireless sensor networks, and then prolonging the life-time of the wireless sensor networks, a minimum spanning tree based energy-balancing multicast routing algorithm is proposed. This algorithm considers the nodes’ position and energy information and introduces the modifying factor and path-blocking technology when selecting the forwarding nodes. Simulation experiments show that the proposed algorithm can effectively balance the energy consumption of sensor nodes, thereby prolonging the lifetime of networks.