Fermented grain fermentation device

The utility model belongs to the technical field of white spirit brewing equipment, and particularly relates to a fermented grain fermentation device. The filter box comprises a box body, a box cover and a filter screen, the top of the box body is of an open structure, and the box cover is located on the upper portion of the box body and hermetically connected with the upper end face of the box body. The filter screen is arranged on the inner side of the box body and divides the box body into an upper cavity and a lower cavity, the upper part of the filter screen is a fermented grain accommodating cavity, and the lower part of the filter screen is a liquid accommodating cavity; a liquid discharge through hole and an opening and closing device for controlling the opening and closing of the liquid discharge through hole are arranged at the bottom of the liquid accommodating cavity; a pit mud fixing device is fixedly arranged on the side surface of the fermented grain accommodating cavity, and pit mud is fixed o