The invention relates to plant chelating and inducing plant restoring technology for soil polluted by heavy metal cadmium and discloses an application of a chelating agent (namely APAM (Anionic polyacrylamide)) for reinforcing amaranthus hypochondriacus to restore the soil polluted by heavy metal cadmium. The specific steps are as follows: the amaranthus hypochondriacus is planted in the soil polluted by the heavy metal cadmium, and 8.33-33.33Kg of chelating agent (APAM) is applied in each 666.7m<2> of the soil polluted by cadmium before 15-25 days when the amaranthus hypochondriacus is harvested, the specific mode is as follows: the APAM is dissolved in water and is applied in the soil in the soil surface spaying manner so as to improve the biological effectiveness and promote the capability of the plant to absorb the heavy metal cadmium, so that the purposes of increasing the accumulation amount of the heavy metal cadmium and improving the heavy metal cadmium extracting efficiency are achieved. The amaranthus hypochondriacus has the advantages of large organism amount, cadmium forcing resistance and uniform gathering property and the like, and the chelating agent (APAM) has the function of activating the heavy metal cadmium and is low in cost, and due to the combination of the amaranthus hypochondriacus and the APAM, the restoring efficiecy of the amaranthus hypochondriacus is improved, and the capability of restoring the soil polluted by the heavy metal cadmium is enhanced.