The invention discloses a temperature-measuring ear tag dismounting structure. The structure comprises an ear stud, a temperature-measuring ear tag and a needle taking device; a clamping groove is formed in one end of the ear stud; the temperature-measuring ear tag comprises a shell with an accommodating cavity and a temperature-measuring probe connected with the shell, a spring, a baffle ring anda plurality of clamping beads, wherein the spring, the baffle ring and the plurality of clamping beads are arranged in the accommodating cavity; one end of the spring is connected with the baffle ring, and the other end of the spring abuts against the shell; the clamping beads are arranged on the side, opposite to the spring, of the baffle ring and arranged in the circumferential direction of thecontaining cavity at intervals, and the baffle ring abuts against the clamping beads to enable the clamping beads to be clamped with the clamping groove; and the needle taking device is used for penetrating through the shell and abutting against the baffle ring to enable the clamping beads to be separated from the clamping grooves. According to the technical scheme, the needle taking device movesbackwards after abutting against the baffle ring, the clamping beads are separated from the baffle ring, and due to the fact that the baffle ring does not provide a pressing force for the clamping beads any more, the ear stud clamping position can be conveniently adjusted or the temperature-measuring ear tag can be conveniently detached at the moment. By means of the structure, the temperature-measuring ear tag can be rapidly disassembled and assembled, the disassembling efficiency is improved, and the labor intensity is relieved.