The utility model relates to a high -voltage power tower nut, specifically speaking relate to a fastening formula antitheft nut. A fastening formula antitheft nut, includes nut body, its characterized in that: the nut body constitute by adapter sleeve and interior nut, the adapter sleeve outside be equipped with the prism structure that is used for the fastening, the inside round hole that has nut in the cooperation of opening, interior nut be cylindrical structure, the screw has been attacked to the inner circle, the outer lane arch has the fastening arris. It is simple that a fastening formula antitheft nut of structure has the installation like this, convenient to use, and it is effectual to prevent burglary, the unable advantage of dismantling through external force of nut.