The invention relates to a method for preparing hydrogen and carbon disulfide, in particular to a method for preparing hydrogen and carbon disulfide by adopting hydrogen sulfide, which aims at solving the shortages existing in reaction (1) and reaction (4) and the problems of preparing hydrogen and carbon disulfide by combining the two reactions. The preparation method comprises the steps, hydrogen sulfide and coke are used as raw materials to generate hydrogen and carbonyl sulfide under the function of low-temperature transformation catalyst, carbonyl sulfide is separated by a cold solvent washing tower, hydrogen is separated by a hydrogen separation device, the obtained carbonyl sulfide is separated by a stripping tower or a rectifying tower so as to decompose the carbonyl sulfide into carbon dioxide and carbon disulfide under the function of low-temperature disproportionation catalyst, carbon disulfide is separated by a condenser so as to obtain carbon dioxide which is then adoptedas gasification agent to prepare carbon monoxide. All reactions are carried out under low-temperature, which reduces the erosion of sulfide to equipment; the processes of the reactions and separationare simple and can be easily operated; the separated products can be used repeatedly, which reduces waste discharge and leads the industrial production to be possible.