Fuente: WIPO "tobacco agriculture" The variable-temperature baking process comprises the following steps: A, harvesting and charging; B, carrying out sine variable-temperature baking to yellow; and C, carrying out sine variable-temperature temperature control and color fixation. And D, sine variable-temperature rib drying. By means of the tobacco leaf curing method, the temperature changing process of the tobacco leaves can be effectively controlled, the temperature change of the tobacco leaves in the curing process is more stable, and the quality of the cured tobacco leaves is better. Meanwhile, by means of the sine variable-temperature temperature control mode, the tobacco leaf baking efficiency can be improved, energy consumption is reduced, and the production cost is reduced.