The invention discloses a solar fan cap. The solar fan cap comprises a cap top, a cap brim and a solar cell panel. One end of the solar cell panel is mounted on one side of the cap top, the other endof the solar cell panel is mounted on the cap brim, and the included angle between the solar cell panel and the cap brim ranges from 35 degrees to 65 degrees. Hinges are mounted on the two sides of the cap brim, a micro motor is mounted at the upper end of the cap brim and connected with the hinges, an output shaft of the micro motor is connected with a fan, and a storage battery and a controllerare arranged between the micro motor and the solar cell panel. The output end of the storage battery is electrically connected with the controller, the storage battery and the controller are located at the upper end of the cap brim, a switch is mounted on the side, away from the storage battery, of the micro motor, and the output end of the controller is electrically connected with the switch. Thesolar fan cap is simple in structure and high in generalization performance, and the trouble that due to the fact that the micro motor is placed improperly in hot summer, sight lines are blocked canbe avoided.