In recent years, unmanned aerial vehicles (UAVs) have demonstrated immense application potential in both military and civilian domains. However, their limited endurance poses a critical challenge to widespread adoption and development. Fortunately, Wireless Power Transfer (WPT) technology has emerged as a promising solution to this problem. This paper aims to investigate a directional coupler mechanism for UAV wireless charging within drone hangars and its supporting wireless charging system. The designed directional coupler mechanism seeks to improve efficiency compared to current non-directional couplers while meeting the lightweight requirements for UAV wireless charging. Finite element simulation was employed for structural modeling and simulation analysis of the magnetic coupler to determine the optimal model for the UAV wireless charging system. Analysis and design of the wireless power transmission system supporting the coupler mechanism were conducted. Finally, to validate the feasibility of the overall design, an experimental prototype was built for system transmission performance testing. The prototype achieved a 40V/5A output at 200W, with an overall system efficiency of approximately 92%.