Floor pipeline reserved hole plugging formwork and construction method

The invention relates to a floor pipeline reserved hole plugging formwork and a construction method, and belongs to the technical field of building construction. The floor pipeline reserved hole plugging formwork and the construction method aim to solve the problems that a wood formwork is not easy to fix before pouring and a poured floor is uneven after pouring in traditional floor pipeline reserved hole plugging. The floor pipeline reserved hole plugging formwork comprises an outer plate and a fixing core, wherein the outer plate comprises a first half outer plate and a second half outer plate which are connected in a buckled mode, and a flange and a groove are arranged at a connecting seam of the first half outer plate and the second half outer plate in a matched mode; the first half outer plate and the second half outer plate are both provided with supporting tables, the supporting tables of the first half outer plate and the second half outer plate are two platform plates provided with the same semicircu