Disclosed is an unmanned aerial vehicle (100), comprising a body (10) and arms (22) for carrying power devices (21), the power devices (21) being used for providing power of flight. The arms (22) aremovably connected to the body (10), and the arms (22) are provided with carrying portions (221) for installing the power devices (21). When the unmanned aerial vehicle (100) is in a flying state, thearms (22) can be unfolded in a first state relative to the body (10), and when the unmanned aerial vehicle (100) is in a non-flying state, the arms (22) can be folded to the periphery of the body (10)in a second state relative to the body (10). When the arms (22) are in the first state, the carrying portions (221) are arranged towards a first direction, and when the arms (22) are in the second state, the carrying portions (221) are arranged towards a second direction, the first direction and the second direction being different. Also provided are an unmanned aerial vehicle, a kit, an assemblymethod and an operation method. The folded unmanned aerial vehicle (100) is small in occupation size, and convenient to store and carry.