The invention discloses a preparation method of beta-cyclodextrin immobilizing charcoal for absorbing and enduring cadmium ions, and belongs to the technical field of innocent treatment of water bodies. The preparation method is characterized in that epichlorohydrin is taken as a crosslinking agent, beta-cyclodextrin serving as a modifier is grafted to the surface of the charcoal under an etherification action, and the characteristics of insolubility and large specific surface area of the charcoal are combined with the high trapping capability of the cyclodextrin for heavy metals, so that a practically-applicable novel water body cadmium ion pollution repairing material is prepared. As proved by researches on the adsorption of the heavy metals in the water bodies, the capability of adsorbing the cadmium ions in the water bodies of the charcoal is greatly improved in comparison to an original material.