Method for fermenting Humao tobacco

The invention provides a method for fermenting a Humao tobacco (an important raw material for cigar), which comprises the following steps: a, preparing brown rice cereal juice; b, preparing an activated polygalacturonic acid hydrolase reagent; c, spraying the brown rice cereal juice onto tobacco stalks; d, spraying the polygalacturonic acid hydrolase reagent onto the tobacco stalks; and e, piling the tobacco stalks at normal temperature, covering the tobacco stalks with jute bags to ferment the tobacco stalks, turning the piles when the temperature in the piles reaches 48 to 68 DEG C for the first time, turning the piles when the temperature in the piles reaches 44 to 64 DEG C for the second time, turning the piles when the temperature in the piles reaches 40 to 60 DEG C for the third time, and finishing the fermentation when the temperature in the piles is reduced to 32 to 35 DEG C. By fermenting the tobacco leaves after adding the polygalacturonic acid hydrolase reagent onto the tobacco leaves, the method can improve the fragrance and cleanness of the tobacco leaves and reduce the acrimony of the tobacco leaves, and has the advantages of simple implementation of the steps, readily available raw material and good fermentation effect.