Patrol unmanned aerial vehicle

The utility model discloses a patrol unmanned aerial vehicle which comprises an unmanned aerial vehicle body, a U-shaped hanging frame arranged at the bottom of the unmanned aerial vehicle body, a holder arranged at the bottom of the U-shaped hanging frame and a collection camera arranged at the bottom of the holder, a plurality of propeller mechanisms are arranged on the top of the unmanned aerial vehicle body in an annular array mode, and U-shaped undercarriages are symmetrically arranged on the two sides of the unmanned aerial vehicle body. During return flight landing, a U-shaped undercarriage drives a T-shaped sliding lug to slide upwards in a T-shaped sliding seat, a sliding barrel moves upwards along a sliding rod to compress a second spring so as to buffer and absorb shock of the unmanned aerial vehicle body, and meanwhile, rollers at the bottom of the U-shaped undercarriage roll outwards to drive a connecting plate to rotate at the bottom end of a vertical plate; at the moment, the bottom ends of the