The invention discloses a nut with an anti-theft function and a using method thereof. The nut comprises an outer sleeve, a first mounting groove, a fixed ring, an inner sleeve, limiting grooves, a locking mechanism, a control mechanism and limiting teeth, wherein the first mounting groove is formed in the inner wall of the outer sleeve, the fixed ring is fixedly connected to the interior of the first mounting groove, the inner sleeve is rotationally connected to the interior of the fixed ring, and the limiting grooves are formed in the inner wall of the outer sleeve and located on the two sides of the first mounting groove. According to the nut with the anti-theft function and the using method thereof, a traditional nut is arranged to be the inner sleeve and the outer sleeve which are matched with each other, meanwhile, the locking mechanism is arranged inside the outer sleeve, so that the nut can only be screwed and cannot be unscrewed, and then the situation that the nut is stolen isavoided; and in addition, the control mechanism is arranged inside the outer sleeve, so that when the nut is unscrewed, a signal can be transmitted to a remote maintenance terminal in time, then thealarm operation is completed, and then related workers can check the nut in time.