The invention discloses a prestressed anchor bolt used for a wind power foundation and an induction heating heat treatment method thereof. The diameter of an anchor bolt rod piece is 36-72 mm, the length is 1-25 m, the shape is plain and round, and the anchor bolt rod piece is made of alloy structural steel. A process including the steps of hardening and tempering, induction heating, quenching and tempering heat treatment is adopted, so that metal crystalline grains are refined to level 9-11. The heat preservation process is omitted after quenching, tempering and heating are conducted so that decarburization is reduced, and incomplete decarburized layers are achieved. The type of steel is the same as that in a traditional process, and compared with a traditional hardening and tempering process, a higher-level bolt product can be produced through the process including the steps of heat treatment, hardening and tempering, quenching and tempering induction heating, for example, a level-8.8 bolt is produced through the traditional hardening and tempering process, and a level-9.8 bolt can be produced though the novel process with the same type of steel. Heat treatment under a micro tension state is achieved through the process including the steps of heat treatment, continuous hardening and tempering, quenching and tempering induction heating, so that the straightness of a long product is ensured. Compared with the traditional hardening and tempering process, the fatigue life of the bolt produced through the process including the steps of heat treatment, continuous hardening and tempering, quenching and tempering induction heating is prolonged to ten million times from two million times.