The invention discloses a UAV (Unmanned aerial vehicle), comprising a fuselage, an arm, a quick connecting and disassembling structure, a crank connecting rod mechanism and a driving mechanism, wherein the quick connecting and disassembling structure comprises a bracket shell with an inner cavity, one end of the bracket shell is provided with a through hole in communication with the inner cavity,and the other end of the bracket shell is fixedly connected with the fuselage or the arm; the crank connecting rod mechanism is disposed in the inner cavity, and comprises a crank, a connecting rod and a sliding member which are connected with each other, and the sliding member reciprocates in the through hole along the axis; when the sliding member extends out of the through hole, the bracket shell is locked with the arm or the fuselage by the sliding member; when the sliding member withdraws into the through hole, the bracket shell is unlocked from the arm or the fuselage; the driving mechanism is used to drive the crank to rotate, thereby driving the sliding member to move. According to the UAV, the fuselage and the arm can be quickly installed and disassembled through the quick connecting and disassembling structure, thereby reducing the packaging volume of the UAV and facilitating transportation.