Abstract: In order to investigate the temperature rise inside cigar tobacco leaf stacks during fermentation, the temperature variation in the fermentation process of domestic cigar tobacco stacks was experimentally measured and numerically simulated. The temperature of the stack core and the average temperature of the core surrounding area were analyzed. The maximum temperature, extreme temperature difference and temperature rise rate were used to determine the fermentation process of the tobacco stack. A numerical model for measuring temperature during tobacco stack fermentation process was established based on the temperature rise rate. The results showed that: 1) In different fermentation cycles, the temperature in the stack core and the average temperature of the core surrounding area first increased and then became stable. 2) As the fermentation frequency increased, the maximum temperature of the stack and the extreme temperature difference first increased and then decreased. When the extreme temperature difference was less than 5 ℃, the uniformity of tobacco stack fermentation was better and the fermentation was almost completed. 3) In each fermentation cycle, the temperature rise rate of the stack core had three stages: a slow change, a rapid increase, and a decrease. When the temperature rise rate continued to decline for more than 24 h, the fermentation was basically completed, which could be used as an indication of the end of stack fermentation and stack turnover. 4) The relative error between the simulated value and the measured value of each temperature measurement point in the stacks was less than 5% with the same change trend. This numerical model provides a practical basis for quantitative analysis of the fermentation process of cigar tobacco leaf stacks.