Mineral area agricultural land second ploughing method

The invention discloses a mining area agricultural land re-ploughing method which comprises the following steps: repairing a heavy metal polluted cultivated land parcel, uniformly ploughing 25-35cm surface soil by adopting ploughing equipment, crushing soil blocks, and fully mixing deeper clean soil with the surface polluted soil; uniformly spreading a passivating agent on the surface of the ploughed soil; leaching or flooding, and fully mixing the passivation material with the soil. According to the method, the soil is ploughed, the surface layer of the soil is loosened, the deep clean soil is mixed with the surface layer polluted soil, the cadmium content in the soil is reduced by more than 50%, and the heavy metal absorption amount of shallow-root plants is reduced; and then the passivating agent is uniformly spread on the surface of the ploughed soil, so that the bioavailability of the heavy metal pollutant cadmium in the soil is further reduced. Through leaching or water flooding, the passivation materia