Fit insulation board of inner frame of steel structure

The invention provides a fit insulation board of an inner frame of a steel structure. The fit insulation board comprises a sealing plate, a thin-walled keel, thin-walled square straight tubes, thin-walled C-shaped steel, thin-walled C-shaped sealing edges, an insulation filling block and self-tapping screws. A slot structure is arranged at the front end of the sealing plate and an insertion blockstructure is arranged at the back end of the sealing plate; the thin-walled keel is arranged in the middle part of the sealing plate, the thin-walled square straight tubes are arranged in the sealingplate and are located on two sides of the thin-walled keel, the thin-walled C-shaped steel is located in the thin-walled square straight tubes and the opened ends thereof face the thin-walled keel, and the thin-walled C-shaped sealing edge is arranged on the side, far away from the thin-walled keel, of each thin-walled square straight tube; and the thin-walled C-shaped sealing edges, the thin-walled square straight tubes,