NOVELTY - Microbial agent comprises (in parts weight): Saccharomyces cerevisiae (1.4-1.8), Pichia pastoris powder (0.2-1.3), Bacillus subtilis (0.45-0.85), B.cereus (0.4-0.8), B.megatherium (0.2-0.6), Lactobacillus plantarum (0.65-1.05) and carrier, where the carrier comprises bran and rice bran in weight ratio of 1:1-2.    USE - The microbial agent is useful in preparation of organic biofertilizer for treating feces of livestock and poultry (all claimed).    ADVANTAGE - The fertilizer is environment-friendly and safe as it contains no chemicals.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) method for preparing the above-cited microbial agent, involves (a) uniformly mixing bran and rice bran in weight ratio of 1:1-2 to obtain carrier, (b) (i) activating, culturing and proliferating the strains of S.cerevisiae and P.pastoris until the desired viable count is 2.5-5 billion colony forming units (cfu)/ml and contacting with the carrier such that the carrier adsorbs more than 2.5 billion cfu/g, (ii) activating, cultivating and enlarging B.subtilis and B.cereus strains until the desired viable count is 2.5-5 billion/ml, and contacting with the carrier such that the carrier adsorbs more than 3 billion cfu/g, (iii) activating, cultivating and enlarging B.megatherium strains until the desired viable count is 1.5-3 billion/ml, and contacting with the carrier such that the carrier adsorbs more than 2 billion cfu/g, and (c) weighing the microbial carriers prepared step (b), uniformly mixing the carriers under aseptic condition, fermenting the carrier mixture at 35-38 degrees C for 24-36 hours, and drying at low temperature of not larger than 55 degrees C until the moisture content is not greater than 20%, the total quantity of desired viable count is not less than 20 billion cfu/g and the mixed bacterial rate is not greater than 10%; (2) organic biofertilizer, comprising (in kg) organic materials (80-100), corn meal (1-2) and the microbial agent (0.8-1.5), where the organic materials is one or mixture of rice husk, saw powder or straw; and (3) method for preparing the organic biofertilizer, involves uniformly mixing the feces of livestock and poultry, organic materials and the corn meal, adjusting the concentration of carbon and nitrogen in the mixture to be 20-25:1, adjusting the moisture content of the mixture to be 65-70% by adding marl, adding the mixed materials into a fermenting bin for pressuring, mixing, deodorizing and sterilizing, inoculating the compound microbial agent for treating feces of livestock and poultry into the mixture, uniformly mixing, stacking, fermenting, unfolding and drying the mixture until the moisture content is decreased to 30%, prilling and drying the fermented product.