The invention discloses a deoxidation method for hydrogenated steel smelting. Under the vacuum condition, a large number of carbonic oxide bubbles are generated through a carbon-oxygen reaction, [o] in molten steel is removed, argon is blown to a ladle bottom, stirring is conducted at the same time, gas of [H], gas of [N] and adhesion inclusions are removed while the carbonic oxide bubbles escape, and the cleanliness of the molten steel can be improved. Vacuum pouring has an obvious effect on dehydrogenation and reduction of the content of nonmetallic inclusions, vacuum pouring mainly depends on the dripping effect of a steel stream in a vacuum state, the driving force of dripping comes from the CO bubbles generated through the C-O reaction in the vacuum state, the CO bubbles are quickly expanded and exploded in the vacuum state, and therefore dripping of the steel stream is driven. Due to the fact that the diffusion path of gas is shortened due to dripping of the steel stream, the gas can be removed more easily. The nonmetallic inclusions mixed into the molten steel lose the carrier of the original molten steel due to dripping of the molten steel and cannot be submerged into a molten steel inner layer which is very deep, and due to the buoyancy generated by the molten steel, foreign exclusions can easily float on the surface of the molten steel, and the purpose of purifying the molten steel is achieved.