NOVELTY - Agent comprises Bacillus subtilis, green Trichoderma viride, Aspergillus niger, white rot fungi and Candida. The mass ratio of Bacillus subtilis, green Trichoderma viride, Aspergillus niger, white rot fungi and Candida is 2:1:2:2:1.    USE - Agent used for rotting wheat straw.    ADVANTAGE - The agent is non-toxic, good degrading effect, easy bacterial access, saves convenience, rotten effect, decomposes organic fertilizer, increase crop yields and quality and prepared in simple and cost-effective manner.    DETAILED DESCRIPTION - Agent comprises Bacillus subtilis, green Trichoderma viride, Aspergillus niger, white rot fungi and Candida. The mass ratio of Bacillus subtilis, green Trichoderma viride, Aspergillus niger, white rot fungi and Candida is 2:1:2:2:1. The cell density of Bacillus subtilis, green Trichoderma viride, Aspergillus niger, white rot fungi and Candida is less than 0.6 billion colony forming unit/g, 0.5 billion colony forming unit/g, 0.4 billion colony forming unit/g, 0.6 billion colony forming unit/g and 0.2 billion colony forming unit/g, respectively. The wheat straw rotten agent is liquid. An INDEPENDENT CLAIM is included for a method for preparing agent, which involves:    (A) preparing culture medium, which includes preparing Luria-Bertani (LB) broth by dissolving 10g tryptone, 5g yeast extract and 10g sodium chloride in 1L flask, adjusting its pH to 7.0-7.5 by 1M sodium hydroxide and water volume is 1L, and then autoclaving, preparing Luria-Bertani solid medium involves adding 15g/L agar in prepared Luria-Bertani broth, preparing potato dextrose agar (PDA) liquid medium by dissolving 200g potato and 20g glucose in 1L volumetric flask and water volume is 1L, and then autoclaving, preparing potato dextrose agar solid medium involves adding 15g/L agar in prepared potato dextrose agar liquid medium, preparing potato dextrose agar liquid induction medium by dissolving 200g potato, 5g glucose and 15g sodium carboxymethyl cellulose in 1L volumetric flask and water volume is 1L, and adjusting its pH to 7.0 by 1M sodium hydroxide and then autoclaving, preparing potato dextrose agar solid induction medium involves adding 15g/L agar in prepared potato dextrose agar liquid induction medium;    (B) preparing agents, which involves preparing Bacillus subtilis bacteria by inoculating Bacillus subtilis into LB solid medium and culturing in incubator at 38 degrees C for 24 hours and then inoculating colonies in LB culture liquid medium, and then shaking at 38 degrees C for 24 hours at 200 revolutions per minute and obtaining Bacillus subtilis strain, inoculating obtained Bacillus subtilis strain into fermenter liquid LB medium and then obtaining Bacillus subtilis bacteria, and then allowed to cryopreservation, preparing Aspergillus niger bacilli involves inoculating Aspergillus niger into PDA solid medium and culture in an incubator at 30 degrees C for 48 hours under sterile conditions to obtain black mycelium, transferring mycelium into liquid culture medium PDA medium and shaking at 30 degrees C for 72 hours at 150 revolutions per minute to obtain Aspergillus niger strains liquid, transferring liquid into fermenter, which is incubated to obtain Aspergillus niger bacteria and then allowed to cryopreservation, preparing Trichoderma broth by inoculating green Trichoderma on a solid PDA slant medium under sterile conditions and then cultured in incubator at 32 degrees C for 48 hours, transferring white mycelium to PDA liquid medium and shaking at 32 degrees C for 72 hours at 180 revolutions per minute until the liquid becomes dark in color to produce spores to obtain a green liquid Trichoderma species, transferring Trichoderma species to fermentation tank in fermentation medium and then expand to obtain green Trichoderma bacteria and then allowed to cryopreservation, preparing white rot fungi bacteria involves inoculating white rot fungus on solid PDA slant medium under sterile conditions in an incubator at 37 degrees C for 48 hours until mycelium grows, transferring the mycelium to PDA broth medium and shaking at 37 degrees C for 72 hours at 180 revolutions per minute to grow mycelium ball and obtaining white rot fungal species, transferring species into fermenter culture to obtain white rot fungi bacteria and then allowed to Cryopreservation, and preparing Candida liquid involves inoculating Candida on solid PDA slant medium under sterile conditions in an incubator at 33 degrees C for 48 hours, inoculating colonies into PDA liquid medium and shaking at 33 degrees C at 200 revolutions per minute for 72 hours, transferring obtained medium into seed fermenter to obtain Candida liquid and then allowed to preserve at low-temperature; and    (C) mixing prepared bacteria Bacillus subtilis, Aspergillus niger broth, green Trichoderma broth, white rot fungi bacteria and Candida liquid in a mass ratio of 2:1:2:2:1 to obtain agent and then determining effective number of viable cells, which is not less than 4 hundred million colony forming unit/g.