NOVELTY - High-efficient biological leavening agent preparing by (i) mixing adsorbent, calcium dihydrogen phosphate, fermented soybean meal, rice bran, corn powder, colza cake, wheat bran, yeast, EM microbial inoculum, Lactobacillus and Bacillus subtilis, adjusting water, and carrying out anaerobic fermentation, (ii) mixing pig excrement, bean pulp, crushed straw, earthworm manure, lees and biological leavening agent, and using molasses aqueous solution, (iii) performing aerobic fermentation, (iv) carrying out anaerobic fermentation, and (v) drying, and freeze-drying, is claimed.    USE - The leavening agent is useful for decreasing pollution gas emission in urine immersing manure technology (claimed).    ADVANTAGE - The leavening agent: has simple production and low use-cost; and achieves recycling utilization of the pig breeding residue; solves the two problems that pig breeding pollutes the environment and the recycling utilization ratio in the existing agent; combines multiple microorganisms; is prepared through two stages of fermentation and domestication process; utilizes pig manure as raw material; increases the fitness of microbial agent in the urine immersing manure technology; can breed quickly microorganisms; has good deodorization effect; eliminates the generation of harmful gases; has low production cost; is suitable for industrial production.    DETAILED DESCRIPTION - High-efficient biological leavening agent preparing by (i) taking 8-10 pts. wt. adsorbent, 3-5 pts. wt. calcium dihydrogen phosphate, 4-6 pts. wt. fermented soybean meal, 10-15 pts. wt. rice bran, 10-15 pts. wt. corn powder, 3-5 pts. wt. colza cake, 8-10 pts. wt. wheat bran, 3-5 pts. wt. yeast, 2-3 pts. wt. EM microbial inoculum, 1-2 pts. wt. Lactobacillus, and 2-3 pts. wt. Bacillus subtilis, stirring and mixing uniformly, using 2% molasses aqueous solution to adjust water to 35-40%, and carrying out anaerobic fermentation at 25-30 degrees C for 3-5 days, (ii) taking 30-50 pts. wt. pig excrement, 20-30 pts. wt. bean pulp, 10-20 pts. wt. crushed straw, 5-10 pts. wt. earthworm manure, 2-3 pts. wt. lees, and 2-3 pts. wt. biological leavening agent, mixing uniformly, and using 2% molasses aqueous solution to adjust water to 40-50%, (iii) performing aerobic fermentation on the mixed mixture compost under aeration condition for 3-5 days, and stirring, (iv) carrying out anaerobic fermentation for 2-3 days, and (v) drying the fermented product, and freeze-drying to maintain water content at 10-15%, is claimed.