This chapter provides a 5000 W high anti-misalignment platform type undersea wireless power transfer (UWPT) station for Autonomous Underwater Vehicles (AUVs). Compared with the docking type or cage type undersea wireless power transfer methods, the presented UWPT system could highly improve the freedom of the charging AUVs. The docking structure design will also be less difficult. The S/S resonant compensation network is adopted to improve the transfer efficiency and power level. The pressure-resistant and corrosion-resistant hull, equipped with acrylic plastic viewports, has been designed to operate at depths greater than 20 m. Compared with the metal material, the acrylic plastic glazing material will highly reduce the interference on the electromagnetic fields and improve the power transfer efficiency. A 5000 W power level undersea wireless power transfer prototype is built to verify the theory analysis. The simulation and experiments are conducted. The simulated and experimental results show that the presented undersea wireless power transfer system could achieve the robust operation performance with the air medium and seawater medium. The maximum efficiency in the air is 94.81% and the maximum efficiency in the seawater is 91.46% without the ferrite core. The presented UWPT system is not subject to the piezomagnetic effect in the ferrite core induced by sea pressure. Its output voltage fluctuation is less than 1.6%, making it suitable for charging AUVs.