The utility model discloses a split type support section bar applied to sunroom, and the utility model relates to sunroom technical field, including bottom installation spare and top installation spare, be equipped with a plurality of room body subassembly and sliding door subassembly between bottom installation spare and top installation spare, the room body subassembly includes top module, top module bottom fixed mounting has the connecting section bar, the connecting section bar bottom fixed mounting has wall module, the wall module includes frame section bar, the frame section bar surrounds frame structure, just the frame structure inside fixed mounting has glass, frame section bar one side is equipped with four slot sheets, just frame section bar is equipped with slot sheet one side both ends and is equipped with fixed groove, frame section bar opposite side end portion sets up the mounting groove, top module structure is identical with wall module, the utility model, can form the stable support structure, and the dismounting of each module can not influence the stability of overall structure, is convenient for the replacement of module, has higher practical value.