The gas stove is of continuous gas-making and whole water jacket type. Saturated air , which is formed by self-produced 0.294MPa steam and air from blower, is used as gasifying agent and comes into gasifier from the bottom via a check valve. Block coal is broken up and filtrated to size of 13~25mm or 25~50 mm. Then the coal is fed into coal bunker by coal feeding system and be fed into stove. Gas produced by stove is removed dusts by gravitational dust cleaner and cyclone dust cleaner and finally be sent to user.