The utility model discloses an anti-theft bolt, which consists of a screw, a nut, a nut lock pin and a key, wherein a lock groove is longitudinally arranged on the outer wall of the screw; a through lock hole is formed on the side wall of the nut; the nut is screwed on the screw; the lock hole corresponds to the lock groove; a key hole is longitudinally formed along the end part of the nut lock pin; the nut lock pin is screwed in the lock hole through the key; and the inner end of the nut lock pin is arranged in the lock groove of the screw. The nut lock pin can be screwed in or out by inserting the key into the lock hole on the nut lock pin to rotate; and the key corresponds to the key hole in shape. The anti-theft bolt is simple to manufacture and mount, has strong anti-theft function, can be repeatedly used, and saves cost.