The invention relates to porous coarse cereal flour including dietary fibers. Mung bean shell, corn husks and sorghum husks are taken to be thoroughly washed and aired; a glycollic acid solution is used for soaking, and the mixture is put into an ultrasonic cleaner to be cleaned; drying is carried out, and the mixture is smashed into powder; fresh pumpkin peel residues, sweet potato peel residues, kudzu vine skin residues, Chinese yam peel residues and lotus root peel residues are cleaned, smashed, blanched with boiling water and cooled, the temperature is kept at 30 DEG C to 35 DEG C, amylase is added for enzymolysis, and enzyme deactivation is carried out; saccharomycetes and lactic acid bacterium inoculation is carried out, and the humidity of the aerobiotic and anaerobic fermentation environment is 85%; cleaning, filtering, precipitation and drying are carried out, and then the mixture is smashed into powder; coarse cereal husk powder, coarse cereal residue powder and Konjac powder are taken, a flavoring agent is added, and the porous coarse cereal flour including the dietary fibers is obtained. Ethyl alcohol is used for ultrasonically eluting the coarse cereal husks, amylase, saccharomycetes and saccharomycetes are added to the husk residues for mixed fermentation, the nutritive value of coarse cereals is improved, and a high healthcare function is achieved. Meanwhile, all the portions of the coarse cereals are reasonably utilized, the best use of the coarse cereals is achieved, cost is reduced to a certain degree, and economic benefits are increased.