The invention discloses an integral residence discharge flue with fireproof and auto-cleaning functions. The integral residence discharge flue comprises an integral flue welded with a stainless steelmetal tube integrally, wherein a heating device and a flue cleaning device are arranged on the integral flue; supporting hoops are arranged at the welded positions of the outer side of the integral flue in a sleeving manner respectively; an oil-water collection tank is communicated with a sewer through a pipeline. According to the integral residence discharge flue with fireproof and auto-cleaningfunctions provided by the invention, the integral flue is washed by using stainless steel water, the heating device and the flue cleaning device mounted on the integral flue are used for cleaning oilcontaminations adhered to the inner wall of the integral flue, when kitchen ventilators in every family are used, the oil contaminations are washed synchronously by washing nozzles, lampblack is purified secondarily through a lampblack purifier on the top of the flue upwards, exhausted gas reaches a relatively high environmental protection effect, and oil stains are discharged to the sewer downwards.