The invention discloses an unmanned aerial vehicle with folding linking arms. The unmanned aerial vehicle structurally comprises a fixing support plate, a connecting main arm, fixing beds,
landing gear support arms and
air humidity detecting devices. The fixing support plate is provided with fixing screws, the connecting main arm is provided with a fixing spindle, a three-way connector and connecting
branch arms, and the
air humidity detecting devices are provided with spiral wings, spiral wing operation mechanisms,
humidity alarm lamps, hollowed-out
sieve plates and
air humidity detecting mechanisms. The unmanned aerial vehicle has the advantages that the
humidity of air at the high agricultural and
forestry altitude can be detected by the aid of the unmanned aerial vehicle when equipmentis used, ground staffs can conveniently judge whether rainfall and agricultural and
forestry protection work needs to be carried out or not, accordingly, the trouble of manual detection can be prevented, the problem of difficulty in detecting the
humidity of the air at the high altitude can be solved, the convenience of agricultural and
forestry work can be improved, and the time and labor can besaved.