Large-voyage unmanned aerial vehicle

The invention discloses a large-voyage unmanned aerial vehicle. The large-voyage unmanned aerial vehicle comprises a machine body, wherein a processing unit and an engine are arranged in the machine body; the processing unit is electrically connected with the engine; rotors are arranged on the machine body and are in transmission connection with the engine; a gasbag is arranged on the inner surface of the machine body; a compressed helium gas storage device and a gas inlet valve are further arranged in the machine body; the gas inlet valve is communicated with the compressed helium gas storage device and the gasbag; a height sensor is arranged below the machine body; and a processing unit is electrically connected with the gas inlet valve and the height sensor respectively. According to the large-voyage unmanned aerial vehicle, buoyancy force of the unmanned aerial vehicle is increased by additionally arranging the gasbag on the machine body of the unmanned aerial vehicle, so that energy consumption when the unmanned aerial vehicle is in the air is reduced, and the voyage of the unmanned aerial vehicle is increased.