The invention discloses a compound microorganism bacterium agent sewage cleaning technology which belongs to the technical field of bioengineering. A great amount of contaminants are discharged into water bodies due to human activities, and as a result, the physical and chemical properties or biocoenosis compositions of the water bodies are changed, so that the use values of the water bodies are decreased. The severe consequence of water body pollution affects not only the health of human being but also industrial and agricultural production. According to the technology, efficient flocculation strain jelly bcereus, bacillus subtilis, aerobic bacillus licheniformis and nitrophilous actinomycete micromonospora are screened and adopted to prepare a compound microorganism bacterium agent (special for sewage). The compound microorganism bacterium agent has the advantages of small usage amount, high flocculation force, quick organic matter decomposition, no antagonism, good aerobic performance, no odor, no secondary pollution, pollution decomposition rate higher than pollution rate, high adaptability and viability, low cost and industrial production availability.