The utility model discloses a building hang wall mounting structure sets up the reservation mouth department that is used for installing the hang wall on the furred ceiling, and the building hang wall mounting structure includes: the jib, its top fixed connection in building top surface, first connecting piece, its have first face unit and with the first face unit looks vertically second face unit, should first face unit and jib fixed connection, the second connecting piece, it has third face unit, also is provided with the portion of bending that is L shape on the third face unit, and the second connecting piece is hung in second face unit through the portion of bending, keep off the cigarette board, its pass reserve mouthful and with third face unit fixed connection. Compared with the prior art, the utility model, the construction method that originally must install the hang wall before the furred ceiling construction has been abandoned to the limitation that can break construction period, the material is flexible and keeps off these aspects of cigarette board change convenience.