The invention discloses a mounting structure of an abutment butt strap. The mounting structure comprises a butt strap and a sleeper beam, wherein one end of the butt strap is built on an abutment, and is connected with a beam body of a bridge; the sleeper beam is paved below the other end of the butt strap; an elastic strutting piece is arranged between the butt strap and the sleeper beam; mutually corresponding vertical through holes are respectively formed in the elastic strutting piece and the butt strap; a pre-tightening threaded hanger rod is penetrated through the vertical through holes; the lower end of the pre-tightening threaded hanger rod is fixed on the sleeper beam, and the upper end of the pre-tightening threaded hanger rod is matched with threads of an adjusting nut; and the compression amount of the elastic strutting piece is adjusted by adjusting the pre-tightening force between the threaded hanger rod and the adjusting nut, so that the elevation of the butt strap is adjusted. The butt strap is pre-pressed to realize the adjustability of the elevation of the butt strap, so that the adaptability to settlement deformation of a foundation is strong, the joint between a bridge surface and a guide road surface are flat, and the bumping of the abutment can be prevented and controlled.