Method for repairing heavy metal polluted soil and special equipment thereof

The invention discloses a method for repairing heavy metal polluted soil and special equipment thereof. The special equipment is a microorganism fuel battery; a positive electrode region consists of a positive electrode and microorganism culture liquid inoculated on the positive electrode; a negative electrode region consists of a catalyst-loaded carbon material and a buffering solution; a detoxification region is separated from the negative electrode region through a filtering membrane; the detoxification region is a sodium chloride aqueous solution. The repairing method comprises the steps of (1) air-drying the heavy metal polluted soil to be repaired, and performing screening and dilution to obtain heavy metal pollution sludge; (2) replacing the sodium chloride aqueous solution in the detoxification region with a heavy metal polluted soil solution, keeping for 3 days to 6 months, and thus finishing repairing. According to the method, the microorganism fuel battery converts organic matters into current, and the generated current is used for electrically repairing the heavy metal polluted soil, so that the repairing treatment speed is high, and the cost is low; the metal is particularly suitable for removing electric pollutants from low-permeation soil.