The utility model provides a grain mixing device, and relates to the technical field of white spirit automatic production. The grain mixing device comprises a supporting frame, a driving device and adriving device, the power mechanism is arranged on the support frame; stirring mechanism, the material overturning device comprises a rotating shaft, a plurality of material overturning blades and a plurality of support assemblies arranged on the rotating shaft. the rotating shaft is rotatably erected on the support frame; wherein one end of the support assembly is connected with the power mechanism, the support assembly comprises a plurality of fixing supports which are distributed around the central axis of the rotating shaft in a circumferential array mode, the fixing supports are obliquelyarranged relative to the central axis of the rotating shaft, and one material turning blade is fixed to each fixing support. The grain mixing device disclosed by the utility model can replace workersto mix materials, undoubtedly improves the wine brewing mixing efficiency, and is high in mechanical controllability, so that factors such as the wine brewing mixing uniformity, the stirring durationand the stirring speed can be better controlled, and the wine brewing quality is ensured.