Truss supporting and limiting mechanism

The utility model relates to the technical field of building construction tools, and discloses a truss supporting and limiting mechanism which comprises a roadbed box plate, a limiting jig frame is arranged on the roadbed box plate, the limiting jig frame comprises a top supporting plate, the top supporting plate is arranged on the roadbed box plate through a limiting supporting assembly, a bearing plate is arranged on the top supporting plate, and the bearing plate is arranged on the roadbed box plate. The bearing plate is provided with a side limiting mechanism used for preventing the truss from sliding away from the side portion of the limiting jig frame, the side limiting mechanism comprises a fastening plate, a limiting sliding groove is formed in the bearing plate, and the fastening plate is movably arranged in the limiting sliding groove through a thread pushing assembly. The truss is clamped through the adjustable fastening plate, so that the truss is fastened and limited, the fastening mode is simple