Abstract: Low-metamorphic coal resources are abundant in China. In mining, the CO concentration exceeds the limit of 0.002 4% in areas such as the return corner of the working face without any signs of spontaneous ignition, which threatens the safe production of the mine. In this paper, five materials of cuprous chloride(CuCl), cuprous bromide(CuBr), silver chloride(AgCl), silver nitrate(AgNO₃) and copper chloride(CuCl₂) are selected as CO absorbent materials, designed the experiment of CO absorption by CO absorbent, and carried out the experiment of CO absorption by single absorbent solution and multiple absorbent compound solutions. Experimental results show, CuCl, CuBr, AgCl and AgNO₃ all have different absorption effects on CO, the single CuCl solution has the best absorption effect, while CuCl₂ has no absorption effect on CO; the compound solution containing CuCl and the CuCl single solution have little difference in CO absorption, and the absorption effect is better when the CuCl in the solution is excessive.