Bolt fastening structure

The utility model discloses a bolt fastening structure, which belongs to the technical field of bolt structures and comprises a connecting structure, a concrete structure is arranged below the connecting structure, four embedded parts are embedded in the concrete structure, the tops of the embedded parts are fixedly connected with bolts, the top ends of the bolts are fixedly connected with limiting parts, and the limiting parts are fixedly connected with the connecting structure. The four bolts are arranged in the connecting structure in a penetrating mode, and nuts are connected to the four bolts in a threaded mode. According to the bolt fastening structure, through the arrangement of the pre-tightening structure, when the connecting structure needs to be pre-tightened, the nut is sleeved with the hexagonal cap, the hexagonal cap is rotated to drive the torsional spring to be twisted, then the nut is completely sleeved with the hexagonal cap, the limiting piece is inserted into the limiting opening at the mo