Solar energy saving method for thermoelectric conversion backflow

The invention discloses a solar energy saving method for thermoelectric conversion backflow. The method comprises the following steps: conveying water-containing sludge into a stirrer through a conveyor, stirring for 5-8 minutes, extruding through an extruder, crushing the extruded semi-dry sludge, extruding into strips, forming, and feeding into a flat drying device; introducing heating hot oil which is stored in an oil storage tank and is heated by a solar heat collector into a hollow heat conduction pipe in the drying device under the action of a heat pump so as to heat air around the heat conduction pipe; rotating a drum, blowing air through a fan at the bottom of the drying device to roll hot air to the top of the drying device to heat the extruded water-containing sludge so as to obtain dried sludge; and recovering the waste heat of the drying device through a thermoelectric conversion system arranged at the top of the drying device, and converting the waste heat into electric energy to be stored. The s