Anti-crash multi-rotor unmanned aerial vehicle

The utility model discloses an anti-crash multi-rotor unmanned aerial vehicle. Machine body, a plurality of arms are symmetrically distributed on the outer side of the body; driving devices are mounted at the tail ends of the vehicle arms; a propeller is mounted at the output end of the driving device; a cavity with a top opening is formed in the middle of the body; a safety cover plate is movablymounted on the cavity; a buffer umbrella, an air generator, a controller and an acceleration sensor are arranged in the cavity; the buffering umbrella comprises an umbrella cover and umbrella ropes.The parachute cord is fixed in the cavity, an air outlet of the air generator is opposite to the parachute canopy, the controller is electrically connected with the air generator, the acceleration sensor and the driving device, at least two landing frames which are centrosymmetric relative to the machine body are arranged at the bottom of the machine body, the tops of the landing frames are hingedto the machine body, and t