The invention relates to a fuel-driven belt-transmission disc type multi-rotor-wing aircraft. The fuel-driven belt-transmission disc type multi-rotor-wing aircraft is provided with covering skins, a fuel-driven engine, a main rack, a power distribution and transmission system and a flight control system, wherein the disc type covering skins are buckled with each other; a plurality of brackets are outwards extended from the power distribution and transmission system and are uniformly spaced, and rotor wing assemblies with changeable propeller pitches are arranged at the front ends of the brackets and comprise rotor wing rotation driving components and rotor wing propeller pitch changing components. According to the fuel-driven belt-transmission disc type multi-rotor-wing aircraft, a plurality of shafts and a plurality of rotor wings are driven by the engine, and the size of rising power of all the shafts is changed through changing the propeller pitches of all the rotor wings, so as to realize the change of the flight attitude of the aircraft; the fuel-driven engine is adopted, so that the effective payload is increased, and the flight time is prolonged, thus the fuel-driven belt-transmission disc type multi-rotor-wing aircraft is particularly applicable to long-time and long-distance operation.