Method for repairing manganese-polluted soil

The invention belongs to the technical field of restoration of manganese-polluted soil, and discloses a method for restoring manganese-polluted soil. According to the method, the phytolacca acinosa seedlings and the matteuccia struthiopteris seedlings are planted into the manganese-polluted soil in an intercropping mode, so that the manganese pollution remediation effect can be greatly improved; meanwhile, on one hand, the straw biochar improved by the method for improving the straw biochar can correspondingly increase the pore channel number of the prepared straw biochar, increase the specific surface area, increase functional groups such as-OH on the surface of the biochar, and improve the immobilization effect on heavy metals including Mn in soil; on the other hand, the prepared straw biochar contains more alkaline functional groups, acid soil such as red soil is improved while the straw biochar is applied, the increase of the pH value of the soil is beneficial to transformation from the form of heavy meta