Anti-falling nut for installing automobile parts

The utility model discloses an anti-drop nut for installing automobile parts, which comprises a nut main body, a limiting piece and a bolt, the middle part of the nut main body is provided with a first screw hole, one end of the nut main body is provided with a first through hole, the first through hole is communicated with the first screw hole, the other end of the nut main body is provided with a second screw hole, and the second screw hole is communicated with the limiting piece. A conical hole is formed between the second screw hole and the first screw hole, the limiting piece is arranged at the end, away from the first through hole, of the nut body, and a second through hole is formed in the middle of the limiting piece. When the nut body is rotated by external force, under the action of the limiting clamping ring and the limiting clamping block, the nut body can be rotated only by large force, due to the fact that the thread direction of the second screw hole is opposite to that of the first screw hole,