Bellows structure is adopted inside the bellows stop valve, and the lower end of the stainless steel bellows is welded on the valve stem to prevent the process fluid from etching the valve stem. The other end is placed between the valve body and the valve cover to form a static seal. Double sealing design is adopted. If the bellows fails, the valve rod packing will also avoid leakage. The bellows is welded to the valve rod to maintain stable operation performance and avoid valve rod vibration caused by valve plug vibration. It is most suitable for pipelines with steam, flammable, explosive, heat transfer oil, high purity, toxic and other media.