High-sealing-performance valve

The utility model relates to the field of waste gas treatment, and discloses a high-sealing-performance valve which comprises a valve body, a supporting rod is fixedly arranged at the top end of the valve body, connecting threads are formed in the supporting rod, a threaded valve rod is in threaded connection with the position, located at the connecting threads, in the supporting rod, and a valve plate is fixedly arranged at the bottom end of the threaded valve rod. According to the utility model, after the connecting pipe is connected, the threaded valve rod can be matched with the connecting thread in the supporting rod by rotating the control rod, so that the valve plate descends and is inserted into the flow stopping plate, the connecting plate is fixedly arranged on the valve plate, and the connecting clamping groove is fixedly formed in the flow stopping plate; the third rubber sealing blocks on the connecting plate can be inserted into the connecting clamping grooves at the same time, the further seali