NOVELTY - Activated carbon is soaked in anaerobic ammoxidized (anammox) basic inorganic salt solution to obtain anammox sludge. Polyvinyl alcohol, sodium alginate and activated carbon are mixed to prepare embedding medium. The anammox sludge and the embedding medium are uniformly mixed under anaerobic condition to obtain sludge-mixed liquid. The sludge-mixed liquid is added into calcium chloride solution to obtain immobilized ball, and cultured in anammox basic inorganic salt solution to obtain anaerobic ammoxidized microorganisms steadily coupled on the activated carbon.    USE - Reinforcement of anaerobic ammoxidized microorganism activity used for sewage treatment plant.    ADVANTAGE - The method provides reinforced anaerobic ammoxidized microorganism having adverse environmental impact resistance. The sewage treatment using the reinforced microorganism enables wastewater with low carbon-nitrogen ratio, and stable operability.    DETAILED DESCRIPTION - Activated carbon is soaked in anaerobic ammoxidized (anammox) basic inorganic salt solution to obtain anammox sludge. Polyvinyl alcohol, sodium alginate and activated carbon are mixed to prepare embedding medium. The anammox sludge and the embedding medium are uniformly mixed under anaerobic condition to obtain sludge-mixed liquid. The sludge-mixed liquid is added into calcium chloride solution to obtain immobilized ball, and cultured in anammox basic inorganic salt solution to obtain anaerobic ammoxidized microorganisms steadily coupled on the activated carbon. The anammox basic inorganic salt solution comprises (in g.L-1) potassium hydrogen carbonate (0.40-0.6), magnesium sulfate heptahydrate (0.30-0.35), potassium dihydrogen phosphate (0.02-0.03), calcium chloride (0.1-0.15), sodium nitrite (0.3-0.4) and ammonium sulfate (0.4-0.5). INDEPENDENT CLAIMS are included for the following:    (1) embedding medium for embedding and reinforcing anammox microorganism activity, which is prepared by using polyvinyl alcohol, sodium alginate and activated carbon in the mass ratio of 10:0.6:1.2; and    (2) solution for reinforcing and fixing anammox microorganisms.