Bridge construction method using old bridge abutment foundation as abutment front retaining wall

The invention discloses a bridge construction method using an old bridge abutment foundation as an abutment front retaining wall. The bridge construction method comprises the steps of old bridge dismantling, measurement and construction of a bridge collapse structure of a new bridge. And the old bridge is dismantled, specifically, the bridge collapse structure of the old bridge is dismantled, and the old bridge abutment foundation of the old bridge is reserved. And a measurement step: measuring the clear span, the height and the width of the old bridge abutment foundation. Building a bridge collapse structure of a new bridge: designing the new bridge according to the height and width of the abutment foundation of the old bridge, using the abutment foundation of the old bridge as a retaining wall, building the bridge collapse structure of the new bridge outside the retaining wall on the two banks, and enabling the retaining walls on the two banks to be located between the two ends of the bridge collapse struct