The utility model provides a split mounting type orifice protective cover, and relates to the technical field of building construction equipment. The split mounting type orifice protective cover comprises a plurality of split mounting single pieces, and after the split mounting single pieces are spliced along the same plane, a complete protective cover can be formed and used for blocking a pile foundation construction orifice. Compared with a traditional integrally-welded protective cover, the assembled orifice protective cover is small in single body size, light in weight and convenient to package, store and transport. Meanwhile, as one protective cover is formed by assembling a plurality of single bodies, the influence of the pore size on the self-weight of the protective cover is small,and the protective cover can be freely and flexibly assembled for use.