The invention discloses a method for improving capacity of descendants of Capsella bursa-pastoris to remedy cadmium-contaminated orchid soil by grafting and belongs to the field of remediation of environmental heavy metal contamination. The method includes the steps of when stalks of rape plants grow to 5+/-0.2cm long, cutting off 2+/-0.2cm long step tips from the stalks as rootstocks, selecting stem tips of cadmium-enriched plants of Capsella bursa-pastoris, growing in winter and producing shoots 5+/-0.2cm long, as scions 3+/-0.2cm long, grafting the stem tips of Capsella bursa-pastoris to the rape rootstocks by cleft grafting, and collecting seeds when the seeds of the grafted Capsella bursa-pastoris are ripe; raising seedlings in autumn, directly transplanting grafted descendant seedlings of the Capsella bursa-pastoris, with two true leaves expanding, into cadmium-contaminated orchid soil, watering to ensure 80% of moisture holding cavity of the field soil, and performing daily management; after 35 days when the grafted descendants of the Capsella bursa-pastoris are in the full-blossom stage, harvesting overground parts of the grafted descendants of the Capsella bursa-pastoris. The grafted descendants of the Capsella bursa-pastoris employing the rape rootstocks allow cadmium extraction per unit area to be increased; cadmium extraction is 93.89% higher than that achieved by un-grafted descendants of Capsella bursa-pastoris and is 30.78% higher than that achieved by self-grafted descendants of Capsella bursa-pastoris.