The invention discloses a novel cigarette tobacco fermentation method and a device thereof. The device comprises a device body and a fermentation device disposed in the device body, the fermentation device comprises a first cavity disposed in the device body, a first fixing block is fixedly connected to the inner wall of the lower side of the first cavity, and the first cavity is provided with a first sliding block which can slide upward and downward and sleeve the first fixing block; tobaccos have main shortages in the natural fermentation process that firstly, due to the fact that tobacco leaves are in close contact with an external environment for a long time, the tobacco leaves are easily damaged by insects; secondly, during the seasonal changes, the tobacco leaves are prone to mildewdue to large changes in temperature and humidity; thirdly, due to the long-term contact with excess air of the tobacco leaves, the color of the tobacco leaves is easily browned and deepened, and natural alcoholization causes serious damage to the tobacco leaves due to the presence of worms, mildew and the like on the one hand. The invention aims to design the device capable of improving the tobacco alcoholization environment to reduce the occurrence of the insects and the mildew.