Remediation method for heavy metal contaminated soil

The invention relates to the technical field of soil microbial remediation, in particular to a remediation method for heavy metal contaminated soil, which comprises the following steps: step 1, activating and culturing magnetotactic bacteria to obtain activated bacterial liquid; 2, the heavy metal contaminated soil blocks are smashed and subjected to impurity removal, and pure heavy metal contaminated soil particles are obtained; thirdly, the heavy metal contaminated soil is repaired through magnetotactic bacteria, the magnetotactic bacteria move downwards under the action of a geomagnetic field, and heavy metal in the bottom-layer mixed solution is fully adsorbed; 4, soil and magnetotactic bacteria are separated, upper-layer standing liquid making contact with the electromagnet is collected, and lower-layer soil is backfilled to the original position; 5, the magnetotactic bacteria and the heavy metal solution are separated, and the heavy metal solution and the magnetotactic bacteria are separated through a s