Cutting device for fermentation tank

The utility model relates to the technical field of cutting devices, and discloses a cutting device used on a fermentation tank, the cutting device comprises an isolation cover mounted on a tank body, the isolation cover is provided with a cutting structure and a transmission structure, the cutting structure comprises a fixing column arranged on the end face of the isolation cover, and the end, away from the isolation cover, of the fixing column is provided with a fixing rod; the fixed rod is sleeved with a static cutter assembly and a movable cutter assembly, the static cutter assembly comprises an upper static cutter and a lower static cutter which are connected outside the fixed rod, the movable cutter assembly comprises an upper movable cutter and a lower movable cutter which are arranged outside the fixed rod in a sleeving mode, a first gap is reserved between the upper movable cutter and the upper static cutter, and a second gap is reserved between the lower movable cutter and the lower static cutter. T