The invention discloses a dragging-type solar-powered airplane and a landing gear thereof. The dragging-type solar-powered airplane comprises wings and a fuselage. A photovoltaic warehouse and a dragging photovoltaic thin film rod are arranged at the bottom of the rear end of the fuselage. The photovoltaic warehouse is internally provided with a telescopic rod. A rotating telescopic device is arranged at the upper end of the telescopic rod. The lower end of the telescopic rod is perpendicularly connected with the middle of the dragging photovoltaic thin film rod. A photovoltaic thin film is connected to the side face of the dragging photovoltaic thin film rod in a pasted mode. The fuselage is internally provided with a controller. The controller is connected with and controls the rotatingtelescopic device. According to the dragging-type solar-powered airplane, the photovoltaic thin film is connected to the rear end of the airplane fuselage in a dragged mode and can be fully expanded and is aligned with solar rays without any supporting and fixing structure through wind power generated by airplane flight, the area of the photovoltaic thin film is not limited by the fuselage either,the light receiving area can be increased reasonably according to the need, the energy conversion capacity of the airplane is improved, the size and weight of the airplane are decreased, and the cruising capacity and load capacity of the airplane are improved, so that the solar-powered airplane has better using value.