The invention discloses a combined steel structure building template. The combined steel structure building template comprises templates and supporting rods, and is characterized by further comprising fixed templates, scaling templates, stabilizing rods, stair fixing baffles, stair scaling baffles, footstep retainers, pushing strips and mold detaching rods, wherein the fixed templates and the scaling templates are provided with mold detaching holes matched with the mold detaching rods respectively; every two templates are detachably connected through a buckle; every two footstep retainers are detachably connected through the corresponding pushing strip; the fixed templates, the scaling templates, the stair fixing baffles and the stair scaling baffles are detachably connected through the stabilizing rods respectively, and the positions of each template and each baffle are adjusted by the stabilizing rods; a supporting rod head detachably connected with each supporting rod is arranged at the top end of the supporting rod; a horizontal groove which is used for supporting a template rib to enable the stress on each template to be balanced is formed in the head of the corresponding supporting rod. The combined steel structure building template is convenient and quick to construct, can be recycled, has the good structural advantage, and is suitable for being widely popularized and applied, and wood resources are greatly saved.