NOVELTY - A combined microbiological composition comprises (wt. %) photosynthetic bacteria (2-3.8), lactobacillus colony (0.6-1.8), beer yeast (1-1.8), gram-positive actinomycete colony (1-3.8), zymolytic mold fungi (1-3.8), culture medium (10-38), and deionized water (65-80). The yeast is present at 1-3.8 wt. %. The culture medium comprises (wt. %) cane sugar (25-75), potassium dihydrogen phosphate (0.5-0.8), disodium hydrogen phosphate (0.2-0.6), iron chloride hydrate (0.4-1.2), zinc vitriol (0.1-0.3), blue vitriol (0-0.001), cobalt nitrate (0-0.001), magnesium sulfate (0.1-0.2), and water (23.7-70).    USE - The combined microbiological composition is useful for sewage.    ADVANTAGE - The composition removes organic and inorganic pollutants in sewage rapidly, effectively, denitrogenate, and dephosphorize, and restrain alga.    DETAILED DESCRIPTION - A combined microbiological composition comprises (wt. %) photosynthetic bacteria (2-3.8), lactobacillus colony (0.6-1.8), beer yeast (1-1.8), gram-positive actinomycete colony (1-3.8), zymolytic mold fungi (1-3.8), culture medium (10-38), and deionized water (65-80). The photosynthetic bacteria is phodopseudomonas palustris, phodopseudomonas acidopshila, phodopseudomonas colloid, phodopseudomonas capsulate, or phodopseudomonas sphaeroides. The lactobacillus is Lactobacillus delbrueckii, Lactobacillus bulgaricus, Lactobacillus, Lactobacillus acidopshila, Lactobacillus paracasei, or Lactobacillus plantarum. The gram-positive actinomycete is Streptomyces paracasei, or Frankia actinomycete. The zymolytic mold fungi is Trichomycin, or Bacterionema matruchofii. The beer yeast is present at 1-3.8 wt. %. The culture medium comprises (wt. %) cane sugar (25-75), potassium dihydrogen phosphate (0.5-0.8), disodium hydrogen phosphate (0.2-0.6), iron chloride hydrate (0.4-1.2), zinc vitriol (0.1-0.3), blue vitriol (0-0.001), cobalt nitrate (0-0.001), magnesium sulfate (0.1-0.2), and water (23.7-70). An INDEPENDENT CLAIM is included for preparation method of combined microbiological preparation.