The invention discloses a fermentation device for baijiu brewing, and belongs to the technical field of agricultural product processing. The fermentation device comprises a fermentation tank, the topof the fermentation tank is provided with a top cover, the middle of the upper surface of the top cover is provided with a handle, the side wall of the fermentation tank is provided with an observation window, and the bottom of the fermentation tank is provided with stirring mechanisms; each stirring mechanism comprises a stirring motor, the output end of each stirring motor is provided with a transmission rod, the two sides of each transmission rod are provided with stirring plates, the two sides of each stirring plate are provided with second smashing teeth, and each stirring plate and the corresponding second smashing teeth are integrally formed. As the fermentation device is provided with the stirring mechanisms, a user can stir materials in the fermentation tank through the stirring plates on the stirring mechanisms, and thus the materials in the fermentation tank are mixed more uniformly; besides, the first smashing teeth and the second smashing teeth on the stirring mechanisms can smash caked materials, then material mixing is facilitated, and thus the production quality of the fermentation device is improved.