The invention discloses an iodine adsorbing material and a preparation method and an application thereof. The preparation method comprises the following steps: (a) mixing a trivalent iron salt hydrate, a divalent copper salt hydrate and acetate, to obtain a mixture; (b) adding a polyhydroxy compound to the mixture, stirring, and performing ultrasonic treatment, to obtain mixed solution; (c) warming the mixed solution to 160-180 DEG C, and heat-preserving and closed-reacting for 8-10 h; and (d) centrifuging the mixed solution after a reaction, collecting a precipitate, washing, and vacuum-drying, to obtain the iodine adsorbing material. The iodine adsorbing material prepared by the preparation method has excellent magnetic property and adsorption property, and is lower in preparation cost.In addition, the preparation method is capable of promoting growth of a nano material, improving a yield, and simple in operation, and beneficial to industrial production through the single-step reaction only.