The utility model provides a novel butterfly valve, include: butterfly plate, valve shaft, valve body, disk seat, valve rod, in the valve shaft is inserted and is located valve body and butterfly plate, its characterized in that: the butterfly plate pass through the valve shaft with valve rod looks fixed connection, still be equipped with a wedge -shaped seal ring between disk seat and the valve body, the whole ring -type that is of wedge -shaped seal ring, it will to be equipped with adoption inflation screw in the middle of the wedge -shaped seal ring wedge -shaped seal ring fixes aperture between disk seat and the valve body, wedge -shaped seal ring's cross -section is the wedge, and by the thickness taper of disk seat to valve body direction reduces, the disk seat internal surface is equipped with the disk seat junk ring, the valve body surface spraying has the epoxy layer. The performance of shafting rigidity is better during the novel butterfly valve atress of present case, is out of shape little, be favorable to the valve open and close and be difficult to destroy the valve shaft both ends sealing saddle moreover.