The invention belongs to the technical field of macromolecular ion exchange resin, and relates to a preparation method for chelating ion exchange resin. The preparation method comprises the following steps of: acidizing a matrix by using acid under the heating condition; washing the matrix by using deionized water until the matrix is neutral; allowing damp air in a sodium bromide or potassium bromide saturated solution reaction kettle to enter the matrix which is treated in the previous steps, so that a water molecule single layer is generated on the surface of the matrix; performing silanization reaction on the hydrated matrix, alkane and a silane coupling agent to obtain a silanized matrix; performing grafting reaction on the silanized matrix and multi-amino polymer to obtain a functional resin material; and performing Mannick reaction on the functional resin material, formaldehyde and phosphorous acid so as to obtain the final chelating ion exchange resin using an inorganic substance as the matrix. The method has the advantages that the operation process is short and the method is convenient to operate. A reagent is not required to be added into an ion exchange column when noble metal ions are adsorbed, so pollution and wastes are avoided.