Three extreme halophilic bacteria strains and composite halophilic bacterium microbial agent containing the three extreme halophilic bacteria strains and uses thereof are provided. The extreme halophilic bacteria strains obtained in the present invention are halomonas sp. CGMCC No.3081, pseudomonas sp. CGMCC No.3082 and bacillus sp. CGMCC No.3083.The composite halophilic bacterium microbial agent containing the extreme halophilic bacteria strains above are also provided. Three extreme halophilic bacteria strains which have tolerance of salinity of 15-25% are isolated. The composite halophilic bacterium microbial agent obtained by combining the three extreme halophilic bacteria strains can treat the wastewater produced in the production process of high-salt cyanuric chloride effectively.
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