The utility model provides a molding device of an aircraft wing-shaped member pelvic fin. The molding device of the aircraft wing-shaped member pelvic fin comprises a left template and a right template, a cavity of the pelvic fin is formed by matching surfaces of the left template and the right template, glue injection port is arranged below the right template, and glue outlets with valves are arranged on the left template and the right template along the outer edge of the cavity. A double-layer sealing groove is respectively arranged on the left template and the right template along the outer edge of the cavity, and requirements of a resin transfer molding process for vacuumizing and sealing are met. A guide plate capable of sliding vertically in the cavity is arranged at the bottom of the cavity, and a guide hole is arranged on the guide plate. The molding device of the aircraft wing-shaped member pelvic fin is high in positioning accuracy, good in sealing performance, reasonable in resin runner and capable of guaranteeing inner quality and apparent quality of large-size foam sandwich carbon cloth skin composite wing-shaped member pelvic fin molding.