The invention provides a tobacco leaf threshing and redrying pretreatment process which comprises processes of tobacco leaf package unpacking, loosening and moisture regaining, impurity removing, grade purifying and tobacco leaf raw material bagging. The tobacco leaf threshing and redrying pretreatment process is characterized in that firstly, according to the moisture condition of tobacco leaf raw materials, the moisture regaining time in a moisture regaining room of the tobacco leaf raw materials is determined, for the tobacco leaf raw materials with the moisture being less than 16%, after the moisture of the tobacco raw materials is increased through the moisture regaining process in the moisture regaining room, tobacco leaf package unpacking, impurity removing and grade purifying are conducted, and the boxing or bagging mode and the temporary storage mode of the tobacco leaf raw materials are determined according to the temporary storage time of the tobacco leaf raw materials in a threshing and redrying enterprise and the local relative air humidity of the threshing and redrying enterprise. Compared with the prior art, the tobacco leaf threshing and redrying pretreatment process has the advantages that breakage of the tobacco leaf raw materials in the unpacking, loosening and grade purifying processes when the moisture content of the tobacco leaf raw materials is lower can be prevented; the temporary storage modes of different tobacco leaf raw materials are determined according to the temporary storage time of the tobacco leaf raw materials, tobacco tar outputting and mildew of tobacco leaves are prevented, and the quality of the stored tobacco leaf raw materials is guaranteed.