Tobacco curing withering period moisture stepped dehumidification treatment method

The invention discloses a stepped moisture reduction treatment method for flue-cured tobacco in the flue-curing withering period. The method comprises the steps that S1, a moisture treatment dry-bulb temperature control point in a curing barn is determined in the tobacco leaf flue-curing withering period; s2, the initial wet bulb temperature corresponding to the moisture treatment dry bulb temperature control point is divided according to stepped dehumidification, the initial wet bulb temperature ranges from 38 DEG C to 40 DEG C, the initial wet bulb temperature is gradually reduced by 0.3 DEG C to 1 DEG C every 1.5 h to 3 h, and finally the initial wet bulb temperature is reduced to 35 DEG C to 36 DEG C; s3, setting a stepped dehumidification curve on a baking controller according to the dry-bulb temperature and the wet-bulb temperature in S1 and S2; s4, running a stepped dehumidification curve, and baking the tobacco leaves until the tobacco leaves on the whole kang become soft and the two layers of tobacco