Building engineering hole filling device

The utility model relates to the technical field of constructional engineering, in particular to a constructional engineering hole filling device which comprises an upper protection plate and a lower protection plate, the upper protection plate and the lower protection plate are oppositely arranged, an upper cavity is formed in the position, close to the center, of the upper protection plate, and a lower cavity is formed in the position, close to the center, of the lower protection plate. Sealing mechanisms are arranged on the opposite sides, close to the edges, of the upper protection plate and the lower protection plate correspondingly, the two sealing mechanisms are oppositely arranged, each sealing mechanism comprises a sealing ring, and extending blocks distributed in an annular array mode are arranged on the opposite sides of the sealing rings; a connecting mechanism used for fixing the upper protection plate and the lower protection plate is arranged between the upper cavity and the lower cavity and co