The invention relates to a rotary table device used for folding a vehicle arm of a mooring unmanned aerial vehicle. The rotary table device comprises a rotary table base not installed on any componentof a mooring unmanned aerial vehicle body, a rotary table mechanism rotationally arranged on the rotary table base, a clamping mechanism with the bottom arranged at the upper end of the rotary tablemechanism, and a vehicle arm rotating component used for fixing and rotationally folding the vehicle arm of the unmanned aerial vehicle, wherein the vehicle arm rotating component is arranged on one side above the clamping mechanism and connected with the clamping mechanism, and the extending direction of the vehicle arm rotating component intersects with the extending direction of the clamping mechanism. On the one hand, the foldable vehicle arm of the unmanned aerial vehicle can be rotated in or out from the position below the vehicle body automatically and conveniently through the device sothat the size and the weight of the unmanned aerial vehicle can be reduced, and transportation is convenient; and on the other hand, the mooring unmanned aerial vehicle body or a body does not need to be provided with any mechanism related to rotation power, the weight of the unmanned aerial vehicle is reduced, the flight energy consumption is reduced, and endurance time is prolonged.