Power-free recycling device for waste heat stepped recycling and waste oil recycling

The utility model discloses a power-free recycling device for waste heat stepped recycling and waste oil recycling. The power-free recycling device comprises a gravity aerator, a filter tank, an oil separation tank, a temperature control valve, a temperature control sensor, a front straight spiral heat exchanging tube, a heat insulation plate and a heat exchanging tank, wherein the gravity aerator can perform automatic aeration by effectively using the gravity potential energy of waste water and can remove greasy dirt contained by the waste water through the oil separation tank by using an air floatation action; the flow directions of the cold and hot waste water are automatically controlled through the temperature control valve so as to achieve system heat exchanging; the greasy dirt in the waste water is effectively recycled by the air floatation principle, sufficient utilization of waste heat is achieved, the waste water is further purified during the process, and the waste heat generated in daily life is effectively utilized; the power-free recycling device is simple and practical, convenient to maintain, safe and environmental friendly, long in service life, high in automation level, capable of effectively recycling the heat carried by the domestic waste water, and capable of automatically recycling the greasy dirt.