The invention discloses a composite fiber adsorption material, which belongs to the technical flied of an adsorption material. The composite fiber adsorption material comprises the following raw materials in parts by weight: 45-55 parts of cotton fiber, 5-12 parts of a pore forming agent, 8-12 parts of carboxymethyl chitosan, 4-8 parts of polyacrylonitrile, 8-15 parts of a styrene-divinylbenzene copolymer, and 0.5-1.5 parts of benzoyl peroxide. According to the invention, cotton fiber is used for static spinning, the added polyacrylonitrile, carboxymethyl chitosan and the styrene-divinylbenzene copolymer are subjected to blending spinning, the prepared composite fiber adsorption material has the advantages of large specific surface area and high porosity amount, has large adsorption quantity on Pb<2+>, Cu<2+>, and Cd<2+>, and is suitable for processing heavy metals in water.