The invention provides a reserved hole mold-hosting device and relates to the field of constructional engineering. The reserved hole mold-hosting device comprises a big supporting frame and a supporting plate, wherein the big supporting frame is arranged above the concrete at the reserved hole; the supporting plate is arranged under the concrete at the reserved hole; a small supporting frame is arranged under the supporting plate; the small supporting frame and the big supporting frame are oppositely arranged; a vertically arranged long bolt penetrates through the middle part of the big supporting frame; a first nut is in threaded connection with the long bolt above the big supporting frame; a first vertical circular ring is welded with the lower end of the long bolt; a vertically arranged short bolt penetrates through the middle part of the small supporting frame; a second nut is in threaded connection with the short bolt under the big supporting frame; a second vertical circular ring is welded with the upper end of the short bolt; a steel wire is connected with the second vertical circular ring; after the steel wire passes through the supporting plate, a rubber seal ring is penetrated through the middle position; the upper end of the steel wire is connected with the first vertical circular ring. The reserved hole mold-hosting device has the advantages of high tool degree, fixing convenience, detaching convenience and reusability.