Abstract: Marine electric ships have been widely used in marine scientific research activities, but their power supply mostly depends on shore-based charging equipment and manual recovery, which results in the low power supply efficiency. An intelligent charging device for electric boat powered by marine energy is designed, which can provide convenient charging for a surface electric boat by utilizing the complementary mode of wind energy and tidal current energy. The navigation and communication functions of the BeiDou Navigation Satellite System (BDS) are used to realize the positioning of the charging device and the real-time communication with the electric ship to guide it to the sea area where the charging device is located. The shore-based terminal realizes the information feedback of the working state of the device through BDS to obtain the real-time charging state of the electric ship. The device can improve the power supply efficiency of the electric boat with clean power source.