NOVELTY - Fermenting straw grass powder for sheep feed, comprises (i) producing mixed feed by fermenting straw grass powder by collecting crop straw and by-product as a powder raw material which does not contain toxic substances, and mechanically milling, carrying out heap fermentation, inserting a thermometer, covering with sacks, straw mats and plastic cloth, and co-fermenting, adding salt and bone powder into fermented grass powder, and mixing corn flour, bran, soybean curd residue and carrot, and directly feeding the sheep; and (ii) feeding the prepared feed into 2 months old sheep.    USE - The method is useful for fermenting straw grass powder for sheep feed (claimed).    ADVANTAGE - The method produces nutritious grass powder, has simple processing, and production processes; is economical; saves: time, and labor intensity while feeding sheep, and feed utilization rate; increases feed intake by sheep, so as to facilitate rapid growth, increase fat content, and milk secretion capacity in sheep.    DETAILED DESCRIPTION - Fermenting straw grass powder for sheep feed, comprises (i) producing mixed feed by fermenting straw grass powder by collecting crop straw and by-product as a powder raw material which does not contain toxic substances, and mechanically milling the raw materials e.g. straw meal added in large volumes, and carrying out heap fermentation of uniformly mixed straw meal powder at a high room temperature into a square heap of 30-50 cm thickness, and then inserting a thermometer, covering with sacks, straw mats and plastic cloth, to maintain the temperature and humidity, until the inner stack temperature reaches 40-50 degrees C, and co-fermenting for 1-1.5 days, once there is emergence of fragrance, and completing the fermentation process, and simultaneously obtaining soft, cooked, hot and fragrant grass powder, and adding 0.5 kg salt and 0.5 kg bone powder/100 kg fermented grass powder, and uniformly mixing corn flour, bran, soybean curd residue and carrot, until the wheat straw is fermented into straw grass powder used as mixed feed, and directly feeding the sheep; and (ii) feeding the prepared feed into 2 months old sheep in a feeding volume from less to more, and then slowly increasing the feed volume, and feeding with high-quality forage and concentrated feed-free from soybean curd residue, so as to prevent diarrhea, and then feeding to an adult sheep by adding feed into a clean feeding rack, and feeding less frequently, taking fermented grass powder, and adding from end to beginning of the feeding process in a stepwise manner, and feeding covered and batch fermented grass powder for at least 3 days.