The utility model discloses a steel wood square column, be the zinc -plated steel bushing of C type including the cross -section, zinc -plated steel bushing upholstery has inlayed the flitch, and the tip of the opening both sides of zinc -plated steel bushing is equipped with the fixed orifices, and the screw passes through the fixed orifices to be fixed zinc -plated steel bushing and flitch and be in the same place, and zinc -plated steel bushing opening both sides are equipped with the package mouth of inside extension, old and useless utilization, resources are saved, the upright degree of steel a tree, used in making timber for boats is high, and multiplicable 5 -10cm props up and establishes the interval, in the open -ended position, can be fixed firm with wooden a tree, used in making timber for boats and template like ordinary wooden a tree, used in making timber for boats and template, steel a tree, used in making timber for boats wood is more regular than traditional flitch, non -deformable, size unified, and roughness such as concrete wall, post, roof beam improve by a wide margin, group's mould also faster than traditional flitch, passes through the estimation, and consequently unit project can advance time limit for a project 3 -7 sky, use steel wood square column, the scene only produces a small amount of bending, deformation, and pile up's shredded wood side no longer appears, need not to connect again, has also reduced reconditioning fee usefulness, synthesizes and saves 30.4%.