Method for restoring Cd-polluted soil or water body

The invention relates to the technical field of restoring heavy-metal polluted soil or water body by using plants, and concretely relates to a method for restoring Cd-polluted soil or water body. The method for restoring Cd-polluted soil or water body employs corydalis davidii as a plant material for restoring Cd-polluted soil or water body, and comprises the following steps: 1) transplanting corydalis davidii seedling into Cd-polluted soil or water body, and keeping the pH value of soil or water body during growth of corydalis davidii to be 5-8; and 2) regularly harvesting corydalis davidii on the ground or the water body until the Cd content in soil or water body reaches environment quality standard requirement. By planting corydalis davidii in soil or water body, Cd in soil or water body is absorbed by corydalis davidii root and also are transferred to stem and leaf on the ground, and by regularly harvesting the overground part and reserving the underground part, Cd in soil or water body is continuously extracted, thereby removing Cd pollution in soil or water body.