ALC wallboard top fixing device

The utility model discloses a top fixing device for an ALC (autoclaved lightweight concrete) wallboard. The top fixing device comprises a fixer which is embedded into the ALC wallboard and is used for assisting the ALC wallboard to be fixed on a concrete beam slab, the fixator is composed of a fixing piece and a position guide pipe perpendicularly connected with the fixing piece, the position guide pipe is a hollow pipe, and a limiting nail is arranged in an inner cavity of the position guide pipe. One end face of a sheet body of the fixing sheet is anchored on the ALC wallboard through a limiting nail, and the free end face of the sheet body of the fixing sheet is anchored on the concrete beam slab through a fastener. The connecting structure has the advantages of being stable in connection and convenient to use, the ALC wallboard can be firmly installed on the concrete beam slab, the structural stability of the ALC wallboard during installation is greatly improved, the reserved caulking width of the top of