The invention discloses a construction technology for broadening and reforming a rigidity matching system of a hollow slab bridge. Rigidity matching members are mounted at the joined parts of new and old bridges and at the bottoms of slabs of the hollow slab bridges in adjacent areas, are transversely arranged along the hollow slab bridges and are arranged at the bottoms of side plates and inner plates of the new and old hollow slab bridges through connecting pieces; the number of the rigidity matching members is determined according the span L of the hollow slab bridges; and the lengths of the rigidity matching members is determined according to the widths of single plates of the new and old hollow slab bridges. According to the construction technology disclosed by the invention, due to the adoption of internal force transmission and rigidity transition of the rigidity matching members, the aims of reducing a transverse distribution peak of a load, easing a transverse distribution curve of the load and realizing the rigidity matching between each two bridge slabs of the new and old hollow slab bridges are achieved; and meanwhile, the integrity of transverse connection of the new and old bridge slabs is enhanced, and the problem that rigidity mutation occurs between connected parts of the new and old bridge slabs cannot be effectively overcome according to a transverse connecting method of an upper structure of a traditional hollow slab bridge is solved.