Embodiments described herein relate to an anti-theft device for commodities, and aims to provide a smart anti-theft tag for boots. The tag can effectively prevent boots from being stolen and is reliable in performance, exquisite in structure and easy to use. According to the technical solution, the smart anti-theft tag for boots comprises a tag holder provided with a circuit board, a sounder component, a coil and a battery, and a hoop assembly movably mounted on the tag holder to be tied on and connected to a heel of a boot, a bolt assembly movably located in the tag holder and used for unidirectional control of the movement of the hoop assembly, and a lock assembly movably located in the tag holder and used to lock the bolt assembly in a moving state.