the invention discloses a carbonic oxide preparing device and method through continuous gasification of pure oxygen coke, which is composed of fixed bed gas producer with gas outlet pipe on the furnace roof, wherein the water jacket is set on the inner wall of gas producer, whose height is 2.6-5.2 m at 0.2-1.6Mpa bearing pressure; the coke distributor connects coke inlet, which is set in the inlet; the level distance between the bottom of coke distributor and packing head on the water jacket is 200-600mm; the height of entocineria layer in the gas producer is at least 1200mm; the idle course height between coke layer roof and coke inlet is 2+-0.5m.