Supporting beam structure for supporting formwork

The invention belongs to the technical field of building construction, and particularly relates to a joist structure for formwork supporting, which comprises two bearing frames and a plurality of groups of adjusting blocks, the two bearing frames are arranged in parallel, the plurality of groups of adjusting blocks are positioned between the two bearing frames, the lower end of each adjusting block is fixedly connected with a corresponding butt joint block, and the butt joint blocks are fixedly connected with the butt joint blocks. A corresponding supporting rod is arranged on the butt joint block in a matched mode, a butt joint rod is fixedly arranged at the center of the upper side wall of the adjusting block, a corresponding supporting plate is connected to the top end of the butt joint rod through a supporting column, an opening is formed in the supporting plate, and a matched tray is vertically and slidably connected into the opening; the lower end of the outer side wall of the tray is fixedly connected