The invention provides an industrial method for improving applicability of senior tobacco leaves through module group secondary rebaking. Senior stock tobacco leaves are subjected to function module grouping, grouping adopts a Schmuck value as a main reference condition, the tobacco leaves with a Schmuck value of 2.8-3.6 are A module Schmuck tobacco leaves with high applicability, the tobacco leaves with a Schmuck value of 2.3-2.8 are B module Schmuck tobacco leaves with medium applicability, and the tobacco leaves with a Schmuck value of 2.3 or below are C module Schmuck tobacco leaves with low applicability; through the grouped function modules, the tobacco leaves are subjected to feed preparation according to a tobacco leaf formula, and are sent to a leaf storage cabinet through vacuum wetting and primary conditioning till the leaf water content is 15%-18% and through secondary conditioning till the leaf water content is 17%-20%, the tobacco leaves in the leaf storage cabinet are subjected top leaf secondary rebaking, a second area temperature key in rebaking is controlled at 70-88 DEG C, temperatures in a first area, a third area and a fourth area are matched and adjusted according to the temperature in the second area, rebaking is completed, and the tobacco leaves are packed in boxes for standby use. According to the industrial method for improving the applicability of the senior tobacco leaves through module group secondary rebaking, the senior stock tobacco leaves can be massively utilized, the stock and the raw material cost are saved, and the tobacco quality is not lowered when the method is applied to a tobacco formula.