The utility model discloses a high-temperature butterfly valve with good sealing performance. The valve comprises a main body pipe, an upper pipe body, a lower pipe body, a valve rod, a valve seat, abaffle ring and a holding rod, wherein the main body pipe is transversely arranged; an upper pipe body and a lower pipe body which are vertically arranged and located on the same axis are arranged onthe main body pipe. Bottom seal of lower pipe body, the valve rod sequentially penetrates through the upper pipe body and the main body pipe downwards from the top of the upper pipe body and finally extends into the lower pipe body; a holding rod is arranged at the top of the valve rod, sealing rings are embedded in the upper pipe body and the lower pipe body, the valve rod is sleeved with the sealing rings, a valve clack is fixed to the valve rod and located in the main body pipe, a baffle ring is arranged in the main body pipe, and an annular valve seat is arranged on the side, close to thevalve clack, of the baffle ring. According to the valve, the sealing table is matched with the sealing hole, and the spring is matched with the first sealing ring and the second sealing ring, so thatthe valve has good sealing performance, and the valve seat is convenient to move.