Square column wrapping structure and assembling method

The invention discloses a square column wrapping structure and an assembling method. The square column wrapping structure comprises a vertical square column, a fixing assembly, a keel assembly and a plurality of plates, the fixing assembly is arranged on the periphery of the square column, the fixing assembly is connected with the plates through the keel assembly, a mounting cavity is defined by the plates, and the square column wrapping structure is arranged in the mounting cavity. The square column, the fixing assembly and the keel assembly are all arranged in the mounting cavity; the fixing assembly comprises two fixing pieces, the two fixing pieces are connected end to end and surround the square column, and the two fixing pieces are connected through fasteners and tightly hold the square column. The assembling method comprises the steps of installing the fixing assembly, installing the double-clamping keel, filling the fireproof sound insulation material, installing the buckle keel and fixing the plate.