The invention discloses a long-life fresh air ventilator. The novel fresh air ventilator includes a return air bin, a fresh air bin, a filter adsorption bin, an air supply bin, an indoor return air inlet, an outdoor fresh air inlet, a coupling, a return air valve sheet, a fresh air valve sheet, a stainless steel wire mesh, a filtering self-cleaning device, a steel wire ball filter, a return air end differential pressure sensor, a fresh air mold end differential pressure sensor, a centrifugal fan and an indoor air outlet; the return air bin is located above the fresh air bin; the air supply binis arranged on the right of the return air bin and the fresh air bin, the stainless steel wire mesh, the filtering self-cleaning device, the steel wire ball filter, the return air end differential pressure sensor and the fresh air mold end differential pressure sensor are arranged between the return air bin, the fresh air bin and the air supply bins. The fresh air ventilator has the advantages that filtering and automatic cleaning are achieved, the service life of a filter element is prolonged, the purification ability is automatically recovered, the use cost is low and the ability is strong.