NOVELTY - Straw rotten agent comprises (in mass%): Bacillus licheniformis (15-18); Bacillus circulans (5-9); Bacillus subtilis (10-14); pasteurizing Clostridium (10-14); Bacillus egaterium (6-10); Bacillus mucilaginosus (1-6); Clostridium acetobutylicum (2-8); hemp Bacillus (1.5-5); and nutrient solution (balance amount) in which the pH value is adjusted to 5.5-5.6 using hydrochloric acid and sodium hydroxide.    USE - The straw rotten agent is useful as fertilizer (claimed) such as bioorganic fertilizer.    ADVANTAGE - The agent exhibits less rotten time, and is eco-friendly.    DETAILED DESCRIPTION - Straw rotten agent comprises (in mass%): Bacillus licheniformis (15-18); Bacillus circulans (5-9); Bacillus subtilis (10-14); pasteurizing Clostridium (10-14); Bacillus egaterium (6-10); Bacillus mucilaginosus (1-6); Clostridium acetobutylicum (2-8); hemp Bacillus (1.5-5); and nutrient solution (balance amount) in which the pH value is adjusted to 5.5-5.6 using hydrochloric acid and sodium hydroxide, where the nutrient solution comprises potassium hydrogen phosphate (2.5 g), ammonium sulfate (1.6 g), magnesium sulfate heptahydrate (0.3 g), calcium chloride (0.3 g), urea (0.4 g), peptone (0.5 g), ferrous sulfate heptahydrate (0.005 g), sodium chloride (0.02 g), manganese sulfate (0.002 g), zinc chloride (0.0017 g), cobalt chloride (0.001 g) and distilled water (1000 ml). INDEPENDENT CLAIMS are included for:    (1) preparing straw rotten agent, comprising mixing above various bacteria and nutrient solution, putting the prepared nutrient liquid to make it reach 1 Kg and then uniformly stirring and placing for more than 12 hours; and    (2) processing straw, comprising stacking the straw with a width of 40 and a height of 30-50 and then adding rotten agent, where each ton of the straw with the rotting agent is 1.25 Kg, uniformly spraying the straw, controlling the straw temperature and humidity and the water content to 40-60 wt.%, where the temperature is normal temperature and the decay time is 2 weeks, hand holding the wet straw into flexible and elastic to form brown color, which is crisp and easy to break up when dry, and decomposing collapsed stack to obtain the nutrient substance content as high as 59 wt.% straw rotten agent product.