Aiming at the energy limitation of wireless sensor network node, an energy-saving network is proposed, which can transform the magnetic field energy of laying wire cables in monitoring environment into electricity power, to ensure energy can be self-sufficient. The collected energy is transmitted by double-tuned impedance network. By designing the loop parameters, the loop is resonated to reduce its own loss. In the networking mode, the energy-saving static network model is adopted instead of the dynamic network model with large consumption. It can also reduce energy consumption by switching working mode of node. The experimental results show that the energy collected by energy harvesting module is 10.93 mJ, which can meet the maximal energy consumption of 4.68 mJ in sensor nodes. It is proved that the energy-saving sensor network can realize self-sufficiency.