The utility model relates to the technical field of unmanned aerial vehicles. More particularly, the present utility model relates to a battery, the utility model relates to a falling protection structure of a multi-rotor unmanned aerial vehicle. The protection structure is arranged on an unmanned aerial vehicle body. The protection structure is flexible supports arranged at the top and the bottomof the machine body and comprises one flexible support arranged at the top of the machine body and three flexible supports arranged at the bottom of the machine body, each flexible support is composed of a magnetic base and a flexible hose, and the flexible hoses are connected with the magnetic bases through threaded connectors. The protection structure further comprises an air bag magnetic blockconnected to the lower portion of the magnetic base, the air bag magnetic block is connected with an air bag, an inflation device is arranged on the air bag, a deflation valve is arranged at the bottom of the air bag, a collision sensor is further arranged in the air bag, and the inflation device is connected with the collision sensor. The flexible landing device is simple in structure and has aflexible landing function, so that flexible landing of the unmanned aerial vehicle is guaranteed, the accidental damage probability of the unmanned aerial vehicle is reduced, and the safety is good.