The invention discloses a nut adjusting structure. The structure comprises a body, a rotary thread is arranged on the inner surface of the body, the top of the body is fixedly connected with a weldingring, telescopic rods are fixedly connected to two sides of the top and the bottom of the body, ends, away from the body, of the telescopic rods are fixedly connected with a square frame, the inner surface of the square frame is fixedly connected with a connection block, the surface of the connection block is fixedly connected with a compression spring, the top and the bottom of the square frameare fixedly connected with an adjusting frame through mounting rods, and the top and the bottom of the square frame are fixedly connected with fixed blocks. According to the nut adjusting structure, firmness of the body is adjusted, an anti-loosening nut achieves detaching of an anti-loosening part, the anti-loosening nut can be repeatedly used, resources are saved, the product whole property is improved, nut loosening is prevented, the structure is simple, cost is low, the industrial production efficiency is effectively improved, and the failures and the safety hidden danger generated by nutloosening can be avoided.