Transformer box cover fastening structure

The utility model relates to a transformer box cover fastening structure which comprises an oil tank; a tank cover is covered on the oil tank; the oil tank is provided with connecting lugs; each connecting lug is provided with a connecting lug briquette; one end of the connecting lug briquette is pressed on the tank cover; threaded holes are arranged in the connecting lug and the connecting lug briquette, and the threaded holes are provided with bolts; the threaded holes are light holes, a hole is arranged on the connecting lug in the horizontal direction, a connecting lug shaft is inserted into the hole, the middle of the connecting lug shaft is provided with the threaded hole, and the bolt is arranged in the threaded hole; at least three connecting lugs and three connecting lug briquettes are uniformly distributed; and six connecting lugs and six connecting lug briquettes are arranged. The tank cover is uniformly stressed in a plurality of parts, the center of the tank cover is not provided with any hole, a