The invention belongs to the field of nanomaterials, in particular to an absorbent material and a preparation thereof. The component of the absorbent material is amorphous carbon, and the absorbent material comprises a nano-mesoporous pore passage structure. The preparation method of the absorbent material comprises the following steps: preparation of an aluminum-doped mesoporous silica core-shell structural sphere, polymerization of furfuryl alcohol, carbonization and removal of a silica template. The absorbent material has higher saturated adsorption amount of bilirubin and very fast absorption rate, thereby being widely applied in the field of medical absorption.