The invention relates to a high-temperature ball valve with a universal floating valve seat. The high-temperature ball valve with the universal floating valve seat comprises a valve body, the valve seat, a ball body, a valve rod, a sealing part and an installation part. The ball body is provided with a spherical sealing surface which is matched with the spherical sealing surface of the valve seat.The high-temperature ball valve with the universal floating valve seat is mainly characterized in that the universal floating combined type valve seat is adopted and is composed of a sealing ring, afloating ring, a snap ring and a pressing plate, the snap ring is inlaid in the annular groove in the inner wall of the channel in the valve body, the axial width of the annular groove is larger thanthe thickness of the snap ring, the floating ring and the pressing plate are fixedly installed on the two sides of the snap ring by screws, the outer circumferential surface of the floating ring is indynamic seal fit with the inner hole wall of the channel of the valve body, the end faces of the two sides of the sealing ring are installed between the pressing plate and the inner step of the floating ring in a dynamic seal manner, the diameter of the excircle of the sealing ring is smaller than the diameter of the inner hole of the floating ring, and the left inner side of the sealing ring isprovided with a spherical sealing surface which is mutually matched with the ball body. In the closing process of the ball body, the concentricity between the spherical sealing surface of the ball body and the spherical sealing surface of the sealing ring is automatically adjusted, and the high-temperature ball valve with the universal floating valve seat has the characteristics of being good in sealing performance, high in production yield, long in service life of products and the like.