The utility model discloses a bolt locking structure which comprises a countersunk head threaded through hole formed in an upper workpiece, and the countersunk head threaded through hole comprises anupper special-shaped countersunk head part and a lower threaded part. A special-shaped gasket is arranged in the upper special-shaped countersunk head part and is matched with the upper special-shapedcountersunk head part; the bolt is connected with the upper special-shaped countersunk head part and the lower threaded part through the special-shaped gasket; and the bolt is welded and fixed with the special-shaped gasket. According to the utility model, the special-shaped gasket is placed on the upper special-shaped countersunk head part; the shape and the size of the special-shaped gasket arematched with those of the upper special-shaped countersunk head part; the bolt penetrates through the special-shaped gasket to be connected with the upper workpiece and the lower workpiece, the boltis tightly pressed on the special-shaped gasket after being tightened, the bolt and the special-shaped gasket are welded and fixed, rotation of the special-shaped gasket is limited through the upper special-shaped countersunk head part, and therefore the possibility that the bolt is loosened is avoided, the bolt is not limited by the installation position, and the application range is wide. In addition, the workpiece is not welded, limitation of the material of the workpiece is avoided, and the application range is wider.