The invention relates to the field of a valve, and provides a dome valve. The dome valve comprises a valve body, a head cover, a rotating shaft, a pneumatic actuator and a positioning oscillating arm and also comprises a bracket, an inner ring, an elastic sealing ring, a hemispherical support and a hemispherical body, wherein the elastic sealing ring is in tight contact with the hemispherical body after being inflated; a first scraping device facing the hemispherical body is arranged at the lower end of the bracket; a round hole is formed in the middle of the head cover; a second scraping device facing the hemispherical body is arranged on the round hole; the hemispherical body is made from a zirconia ceramic material; a self-lubricating shaft sleeve is arranged in a through hole in an interference fit manner; and the rotating shaft is arranged in the self-lubricating shaft sleeve in a penetration manner and is in running fit with the self-lubricating shaft sleeve. The dome valve has the beneficial effects that materials on the hemispherical body are effectively prevented from scaling and accumulating; the hemispherical body has a good heat insulation effect; the abrasion of the elastic sealing ring is reduced; the shaft sleeve of the rotating shaft can lubricate by itself; the maintenance cost is low; and the valve has a good sealing property and high reliability and is wide in application range, reliable in operation and compact in structure.