Return water pipeline for strengthening safety of heat supply network

The utility model provides a return water pipeline for strengthening safety of a heat supply network. A plurality of one-way hard sealing butterfly valves are arranged in the return water pipeline, each one-way hard sealing butterfly valve comprises a butterfly plate, an inlet surface of each one-way hard sealing butterfly valve is provided with one surface of a semi-cylinder in the diameter direction of the butterfly plate, the other surface of each butterfly plate is an outlet surface of each one-way hard sealing butterfly valve, each inlet surface is arranged at the end, where water flows out, in the return water pipeline, each outlet surface is arranged at the end, where the water flows in, in the return water pipeline, when the emergency situation that leakage points exist in the pipeline before a return water pipeline valve is passed through occurs, sealing performance of the valve is improved, the water in the return water pipeline is prevented from flowing backwards, safety of the return water pipelin