The invention relates to an adjustable air distribution and atomization swirling disc of a fully-adjustable fuel burner of an external fixing plate, which is used for dynamically adjusting the air distribution and atomization of flame during fuel burning. The adjustable air distribution and atomization swirling disc consists of an air distribution and atomization swirling disc (1) which comprises an inner ring (1.3), an outer ring (1.1), an adjustable vane (1.2) and a fixed cyclone plate (1.4), wherein, the inner ring (1.3) and the outer ring (1.1) are coaxially arranged inside and outside and both have a fore layer and a rear layer; the adjustable vane (1.2) is arranged between the inner ring (1.3) and the outer ring (1.1); an inner end and an outer end of the adjustable vane (1.2) are both provided with two return points; the two return points of the inner end are respectively installed in two return holes of the fore layer and the rear layer of the inner ring (1.3) and the two return points of the outer end are respectively installed in two return holes of the fore layer and the rear layer of the outer ring (1.1); the fixed cyclone plate (1.4) takes the shape of a ring and is arranged at the periphery of the outer ring (1.1); and the inner ring of the fixed cyclone plate (1.4) is fixedly connected with the outer edge of the outer ring (1.1). The length-diameter ratio of the flame can be dynamically adjusted without the blowout of the furnace during the fuel burning.