The invention relates to the field of microbial fermentation, in particular to a compound microbial fermentation feed preparation machine. The technical problem to be solved by the present invention is to provide a compound microbial fermented feed preparation machine that is convenient for crushing materials, saves time and effort in operation, can efficiently screen materials in time after crushing, and avoids solidification of materials during stirring. A compound microbial fermentation feed preparation machine, including a base plate, a pillar, a fixed frame, a preparation box, a discharge pipe, a discharge valve, a first bearing seat, a first rotating shaft, a first sprocket wheel, a first transmission chain, and a variable frequency motor , the second sprocket, the first bevel gear, the second bevel gear, etc. The invention achieves the effect of convenient crushing of materials, time-saving and labor-saving operation, timely and efficient screening of materials after crushing, and avoiding solidification of materials during stirring.