The invention discloses a method for accelerating plants to absorb heavy metals by using plants. The room-temperature seedling cultivation is performed for wild sweet potatoes by a cuttage mode, the alive cultivated wild sweet potato seedlings are cultivated in soil containing the heavy metals, and the growth of the wild sweet potato seedlings is managed; or the wild sweet potatoes are directly cultivated in the soil containing the heavy metals through a cuttage or steam embedding mode, and after the wild sweet potato seedlings cover the surface of the soil, lolium perenne seeds, pteris vittata spores and/or other rich plant seeds treated by a growth agent are sowed, or abundant plants are sowed when the wild sweet potatoes are cultivated. The abundant plants are matched with the wild sweet potatoes; and the wild sweet potatoes are used for accelerating the abundant plants to absorb the heavy metals in the soil, so that the content of the heavy metals in the soil is reduced, the polluted soil is effectively repaired, and the quality of the polluted soil is greatly improved.