The utility model relates to the technical field of road reconstruction construction, in particular to an old pavement reconstruction edge widening structure, an old pavement is sequentially composed of an original roadbed, an original
cushion layer, an original base layer and an original
surface layer from bottom to top, the old pavement comprises a V-shaped groove, the V-shaped groove is formed in one side of the old pavement, and the side, corresponding to the V-shaped groove, of the old pavement is of a step structure; the backfill base material is arranged in the V-shaped groove, and the top of the backfill base material is flush with the top of the original roadbed; the new base layer is paved on the top of the new
cushion layer and is flush with the top of the original base layer; and the new
surface layer is paved at the top of the new base layer and is flush with the top of the original
surface layer. The V-shaped groove is used for burying backfill base materials, the problem of
waste treatment is solved, meanwhile, soil taken out when the V-shaped groove is formed is used for forming a new roadbed, and therefore stability and consistency of structural materials of a broadened part are guaranteed.