The invention relates to the field of liquor processing, and particularly discloses a liquor brewing device comprising a steam box, a box cover, a quantitative water spraying mechanism and a pluralityof stirring mechanisms, the box cover and the steam box are detachably connected, the bottom of the steam box is provided with a heating mechanism, a receiving part is horizontally installed in the steam box, the receiving plate is provided with a plurality of grooves for placing grains, and each groove is provided with a plurality of through holes; each stirring mechanism comprises a guiding rod, a rack and a stirring unit, the stirring unit comprises a gear and a vertically-arranged stirring rod, the guiding rods is horizontally installed in the steam box, the guiding rod is internally provided with a mounting cavity, the rack is horizontally slidably installed in the mounting cavity, and two opposite sides of the steam box are provided with sliding holes for the two ends of the rack topass through; the gear is rotatably mounted in the mounting cavity, the gear meshes with the rack, the upper end of the stirring rod is coaxially welded with the gear, and the lower end of the stirring rod passes through the guiding rod and is located in the groove. The liquor brewing device can stir the grains in the steam box to improve the distillation efficiency of liquor.