The invention discloses a disc culture bed for stacking fermented grains. A disc central post in an enclosure movably penetrates through the center of a disc; a disc driving motor drives the disc to rotate; the disc divides the enclosure into an upper layer and a lower layer; the lower layer of the enclosure is provided with an air inlet; the upper layer of the enclosure is provided with an air vent, a forced air vent, a feed port and a discharge port; an air inlet/exhaust system is respectively communicated with the air inlet and the air vent in the enclosure through air pipes; an inlet/outlet material conveyor and a turnover gear are arranged above the disc; the two ends of the inlet/outlet material conveyor are respectively connected with an elevator mechanism assembly which is arranged on the disc central post and outside the enclosure; a rotating shaft of the inlet/outlet material conveyor penetrates through the enclosure and then is in transmission connection with an inlet/outlet material conveyor driving motor; the turnover gear is vertical to the disc; and the rotating shaft penetrates through the top of the enclosure and then is in transmission connection with a turnover gear driving motor. The disc culture bed disclosed by the invention can be used for replacing manual-stacking fermentation culture of fermented grains in traditional production of fermented grains, reducing the labour intensity of workers and improving the production efficiency.