NOVELTY - An extreme halophilic bacterium, where the halophilic bacterium is salt monocelled bacterium with a preservation number of CGMCC No. 3081, is new.    USE - The extreme halophilic bacterium is useful in treating high salt production wastewater (claimed).    ADVANTAGE - The extreme halophilic bacterium has a tolerance of salinity of 15-25%; where the composite halophilic bacteria microbial inoculum obtained by combining the three extreme halophilic bacteria can treat the wastewater produced in the production process of high-salt cyanuric chloride effectively. Moreover, compared with other treatment technologies, the process is much more appropriate for the national policy of recycling economy and energy conservation and emission reduction. Additionally, the operation cost can be greatly saved; and wastewater is changed into resource.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are:    (1) a composite halophilic bacterium microbial inoculum comprising any two or three of the extreme halophilic bacteria;    (2) a preparation method of the composite halophilic bacterium microbial inoculum comprising: (a) putting one or more of the halophilic bacteria into a composite microbial inoculum culture medium and cultivating for 7-10 days at 25-35 degrees C; and (b) amplifying and cultivating the composite extreme halophilic bacteria in amplification culture medium to obtain composite halophilic bacterium microbial inoculum; and    (3) a method for treating the wastewater obtained in producing high salt, comprising throwing the composite halophilic bacterium microbial inoculum into a wastewater treatment system; where the concentration of chemical oxygen demand (COD) in the production wastewater is 3000-3500 mg/L; and the added COD accounts for 1/10 to 1/20 of the system in volume.    DESCRIPTION OF DRAWING(S) - The drawing shows a flow diagram of the process for preparing the composite halophilic bacterium microbial inoculum (Drawing includes non-English language text).