Heavy metal pollution purification device and purification method applied to farmland

The invention relates to a heavy metal pollution purification device and purification method applied to farmland, and belongs to the technical field of heavy metal pollution purification. The invention discloses a heavy metal pollution purification device applied to farmland. The heavy metal pollution purification device comprises a stirring mechanism, an electrolysis mechanism communicated with the stirring mechanism, a seeding mechanism communicated with the electrolysis mechanism and a purification mechanism communicated with the electrolysis mechanism, the purification mechanism comprises a thermal desorption box and a pickling cylinder communicated with the thermal desorption box; the pickling cylinder comprises a cylinder body of which the top is communicated with the thermal desorption box, a hopper which is connected to the bottom of the cylinder body in a sliding manner, and a flow guide pipe which is arranged at the bottom of the cylinder body and is communicated with the bottom of the hopper; and a