Bacteria-algae composition for degrading water body and directionally eliminating blue-green algae as well as production process and device

The invention discloses a bacteria-algae composition for degrading water and directionally eliminating blue-green algae, the bacteria-algae composition comprises the following components in percentage by weight: 80%-85% of compound bacteria, 5%-10% of compound enzyme and 10%-15% of nutrient elements, and the compound bacteria comprise 25%-30% of bacillus licheniformis, 20%-25% of bacillus subtilis, 5%-10% of compound enzyme and 10%-15% of nutrient elements, 17%-28% of lactobacillus plantarum, 13%-20% of rhodopseudomonas palustris and 13%-20% of rhodotorula glutinis; the compound enzyme comprises the following components in percentage by mass: 30% of pectinase, 30% of glucanase and 40% of cellulase. Stable proliferation can be realized under a relatively low dissolved oxygen condition, and the energy consumption required by aeration is reduced. The selected strains are consistent in growth rate and have compound fermentation conditions, so that the production and use cost is reduced. By adding chlorella into the complex microbial inoculant, the proliferation stability and the nitrogen, phosphorus and COD removal capacity of the complex microbial inoculant are improved, the directional degradation effect on cyanobacteria is achieved, and cyanobacterial bloom is inhibited.