The invention relates to the field of unmanned aerial vehicles, in particular to an unmanned aerial vehicle collision protection device. The unmanned aerial vehicle collision protection device comprises a disc-shaped protection frame capable of coating a vehicle body and all wings of an unmanned aerial vehicle and at least four anti-collision pieces arranged in the clockwise direction of the vehicle body of the unmanned aerial vehicle. All the anti-collision pieces are connected with the disc-shaped protection frame through shock absorption pieces. A notch for an undercarriage of the unmannedaerial vehicle to be exposed outside is formed in the bottom of the disc-shaped protection frame. A connecting seat is fixedly arranged at the top of the vehicle body of the unmanned aerial vehicle. Supporting arms in bolted connection with the connecting seat are arranged at the top of the disc-shaped protection frame. Each anti-collision piece comprises a buffer bin, a trigger inductor arrangedin the buffer bin and a rolling wheel piece arranged on the outer portion of the buffer bin. Multiple miniature adjusting fans are arranged at the bottom of the disc-shaped protection frame. Anti-collision protection can be effectively conducted on the flying unmanned aerial vehicle, imbalance generated after the unmanned aerial vehicle is impacted can be compensated, and the unmanned aerial vehicle is prevented from being laterally turned over and falling in the air.