The invention provides a hard seal butterfly valve allowing a seal ring to be replaceable. The hard seal butterfly valve comprises a valve body, a valve carrier and a valve board, wherein the valve body and the valve carrier are formed in an integrated mode, the valve board is located in the valve body, and the contact position of the valve board and the valve carrier is provided with the hard seal ring. The hard seal butterfly valve is characterized in that the hard seal ring is round, a plurality of screw holes are evenly formed in the hard seal ring in the circumferential direction, the outer edge of the valve board is provided with a groove in the circumferential direction, the hard seal ring is fixed in the groove through screws, one surface, making contact with the valve board, of the hard seal ring is provided with a groove, and an O-shaped ring is arranged in the groove of the hard seal ring. The hard seal butterfly valve allowing the seal ring to be replaceable is simple in structure, the seal ring is assembled and disassembled conveniently and replaced easily, and service life of the valve is prolonged.