The invention discloses an integrated preparation method for straw fodder. The integrated preparation method comprises the following steps: cutting straws into pieces, and spreading to obtain a firststraw bed; weighing glucoamylase, hemicellulase and cellulase, preparing into first mixed liquid of which the mass fraction is 10%, spraying the first mixed liquid on the first straw bed to obtain a second straw bed; weighing urea, ammonium bicarbonate, ammonium carbonate and ammonium chloride to prepare second mixed liquid of which the mass fraction is 20%, spraying the second mixed liquid on thesecond straw bed, carrying out sealing processing for 7 days, drying, and smashing into straw powder; mixing the straw powder and third mixing liquid, standing under the environment of -5 DEG C for 12h, taking out to be unfrozen, carrying out microwave radiation and rotary evaporation and concentration, and drying to obtain modified straw powder; adding a fodder additive into the modified straw powder to prepare the straw fodder. According to the integrated preparation method, the palatability of the straw fodder can be improved, the nutrition value of the straw fodder is improved, and meanwhile, the straw fodder can be more easily digested by livestock.