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This utility model discloses a PTFE membrane fixing structure for irregular roof support cylinders. The PTFE membrane fixing structure is fixed to the steel structure roof or the steel structure support cylinder and is fixedly connected to the PTFE membrane. The PTFE membrane fixing structure includes a first PTFE membrane fixing component for fixing the connection position between the steel structure roof and the steel structure support cylinder, a second PTFE membrane fixing component for fixing adjacent PTFE membranes, and a third PTFE membrane fixing component for fixing the PTFE membrane at the bottom of the steel structure support cylinder. The arrangement of the first, second, and third PTFE membrane fixing components ensures that the PTFE membrane can be fixed at different positions on the steel structure support cylinder, as well as at the connection position between the steel structure roof and the steel structure support cylinder. This ensures that each PTFE membrane can adhere to the steel structure support cylinder or the connection point between the steel structure roof and the steel structure support cylinder, and that each PTFE membrane can exhibit the advantages and effects of the membrane material on curved surfaces, arcs, and curved surfaces.