The utility model discloses an assembled steel construction parapet, include: the cast -in -place parapet of concrete, a set of ALC board and be used for supporting the steel structure support systemof parapet, be equipped with the layer board on the cast -in -place parapet of concrete, on the cast -in -place parapet of concrete was located to steel structure support system, it was connected withcast -in -place parapet of concrete and main body steel structure, the ALC board is located on the layer board to with steel structure support system fixed connection. The utility model discloses inan assembled steel construction parapet, its structure of having optimized the steel construction building, it is through cooperateing steel structure support system and the cast -in -place parapet ofconcrete, great improvement its support the performance, and simultaneously, the layer board has still been set up on the cast -in -place parapet of concrete, it has reliable suspension support to make the ALC board join externally daughter's wallboard promptly, it not only can keep out the wind and to regard the backer, great improvement the support performance of whole cavity, the security performance of its construction of great improvement and later stage use.