High-sealing adjustment butterfly valve

The utility model relates to a high-sealing adjustment butterfly valve. A support and the inner side of the upper plane of a valve body are movably mounted together through a small bolt and nut, and the height of the support and the height of the valve body can be adjusted through an outer bolt and nut and an inner bolt and nut. A lower cover and the valve body are movably mounted together by adjusting a bolt and nut, an ejection convex column is coaxially arranged at the central shaft position and a lower shaft of the lower cover, and the ejection convex column can eject the lower shaft or be far away from the lower shaft when the bolt and nut are adjusted to move up and down. The butterfly valve can adjust a butterfly plate to make up-down movement according to practical situations, the sealing property of the butterfly valve is improved, a user can use the butterfly valve conveniently, the production cost of enterprises is saved, the using requirements of different occasions are met, using is facilitated, and the applied range of the butterfly valve is widened. Due to the fact that the valve body is made of ductile iron, the sealing face of the valve body is made of build up welding stainless steel, the service life of the sealing face is greatly prolonged, and therefore the service life of the butterfly valve is further prolonged.