The invention belongs to the technical field of industrial exhaust gas processing, and more specifically discloses a method used for increasing boiler flue gas dedusting efficiency. A high voltage rectifier transformer adopted in the method comprises slide sleeves, a connecting plate, springs, supporting rods, and a reinforcing plate; the damping springs are arranged in center holes of the slide sleeves in a slide manner; the slide sleeves are fixedly connected with the connecting plate; a set of supporting rods are arranged at the left end of the connecting plate, and a set of supporting rodsare arranged at the right end of the connecting plate; the lower ends of the supporting rods are connected with the upper end surface of the connecting plate through hinge joint; the reinforcing plate is arranged between a roller at the upper end of the right side supporting rod and the right side wall of a transformer box body. In using, the roller is used for pressing an arc-shaped groove on the reinforcing plate at the side surface of the transformer box body, so that moving of one end of the connecting plate by pushing of the supporting rods downward is realized, and then the slide sleeves are driven by the connecting plate to apply torque on the damping springs, the reverse action force of the damping springs is capable of realizing compensation of the inclination of the transformerbox body, the shaking from the inclination direction of the transformer box body is reduced, and transformer service life is prolonged.