Fermentation device for biological fermentation of white spirit vinasse

The fermentation device comprises an inner tank body and a lock cover assembly, the inner tank body comprises a cylindrical barrel body, a bottom plate integrally formed with the barrel body and a cover body connected with the opening end of the barrel body in a clamped mode, and the lock cover assembly is used for fixing the cover body. The cover locking assembly comprises a pressing rod, a sliding block, a connecting rod, a limiting block, a spring, a rotating shaft and a center rod. The sealing device is reasonable in structure, the cover body is limited and fixed through the cover locking assembly, air is injected into the negative pressure pipe through the air pump, and the negative pressure pipe expands after being inflated until the outer wall is attached to the cover body, so that a gap between the cover body and the barrel body is filled, sealing is completed, and the problems that existing traditional vinasse fermentation equipment is simple and crude and poor in sealing effect are solved; the tempe