Aircraft inverted flight test oil tank

An aircraft inverted flight test oil tank comprises a tank body and a cover plate. The upper end of the tank body is provided with the cover plate. An oil supply system is connected to the bottom end of the tank body. A partition plate is arranged in the tank body. The periphery of the inner wall of the tank body is provided with blocking pieces. The partition plate and the blocking pieces are in lap joint and fixedly connected through set screws, so that the inverted flight oil tank capacity is formed. The cover plate and the skirt edge on the periphery of an upper end opening of the tank body are fixedly connected through set screws. A plurality of one-way valves of which openings face one side of the bottom end of the tank body are installed on the partition plate. Different capacities of the inverted flight oil tank can be achieved by replacing the replaceable partition plate in the middle of the oil tank, the aircraft development period and expenditures are saved, and meanwhile the oil tank can be recycl