Underground microwave heating device using thermoelectric material for self-power supply and working method of underground microwave heating device

The invention discloses an underground microwave heating device using thermoelectric materials for self power supply and a working method thereof, a power generation cylinder comprises an insulation protection cylinder and a power generation unit, and P-type and N-type thermoelectric crystals of the power generation unit are arranged in an inner cavity of the insulation protection cylinder; the power transformation device is connected with the microwave emission device; when one power generation cylinder is adopted, the slips and the microwave emission device are arranged at the two ends of the insulation protection cylinder respectively, and the multiple power generation units connected in series are connected with a power transformation device. When more than two power generation cylinders are adopted, the insulating protection cylinders of the power generation cylinders are sequentially connected into a row through elastic structures, the slip is arranged on the insulating protection cylinder of the power