In the battlefield reconnaissance and monitoring environment, Wireless Sensor Network (WSN) is widely used, and the energy problem has always been one of the key problems in related application research. The emergence of wireless energy transfer technology solves this problem well. For large-scale wireless sensor networks, the network can be evenly divided into a number of regular hexagon cells, wireless mobile charging devices traverse the center of each regular hexagon node. However, this division of the regular hexagon will cause the nodes which are close to each other to be distributed in different areas, so that the wireless mobile charging device will spend more time on the journey. In this paper, a division method based on circle is proposed. Through data comparison, the node energy supplement strategy based on circle structure can spend less time to complete charging.