Fermentation device and fermentation tank cover thereof

The utility model discloses a fermentation device and its fermentation tank cover, the fermentation tank cover comprises an outer cover and an inner cover, the outer cover is used for covering the fermentation tank and is provided with a filling hole, the inner cover is covered on the filling hole, the outer cover is provided with a first limiting wall along the inner wall of the filling hole, and the inner wall of the inner cover is provided with a second limiting wall along the inner wall of the filling hole. The inner cover comprises a second limiting wall abutting against the first limiting wall, one of the first limiting wall and the second limiting wall is provided with a limiting groove, the other one of the first limiting wall and the second limiting wall is provided with a limiting block embedded in the limiting groove, and the inner cover is axially limited relative to the outer cover through clamping fit of the limiting block and the limiting groove. According to the fermentation tank cover provide