The invention discloses a two-quick-step and one-slow-step loose-leaf curing method for flue-cured tobacco. The method comprises three steps of yellowing, color fixing and stem drying. In the early days of yellowing, the wet-bulb temperature and the wet-and-dry bulb heating speed are lowered to prevent tobacco leaves from excessive dewatering from the start of yellowing to the not completely yellowed state, so that the activity of tobacco leaf tissue cells is improved, the enzyme activity is enhanced, decomposition and transformation of starch, protein and chlorophyll are promoted, tobacco leaf yellowing is promoted and aroma substances are increased; in the later period of yellowing, the curing time is prolonged to promote formation and accumulation of the aroma substances, the oil content of tobacco leaves is increased, accordingly, the quality of preliminarily flue-cured tobacco is improved and golden yellow tobacco is increased; and in the color fixing and stem drying stages, the curing time is shortened to prevent polyphenols from being oxidized into quinones under the action of polyphenol oxidase, accordingly, tobacco leaves are prevented from darkening, loss of the aroma substances is avoided and the production cost is lowered. The two-quick-step and one-slow-step loose-leaf curing method has the characteristics of being high in operability, improving the tobacco leaf quality, shortening the overall curing time and lowering the cost.