The invention provides a processing technique of waste water containing antibiotic and the purpose thereof, wherein, the technique adopts the following steps: pretreatment, two-phase anaerobic, improving SBR, immobilized microorganism-aeration biological filter, and improving the coagulating sedimentation combination technique. The detailed technique is introduced in the specification. The invention has the advantages that the industrial waste water is pretreated and the two-phase anaerobic technique is adopted, the great mass of sulfate radical is eliminated, the treatment effect for producing firedamp anaerobic phase and the stability of operation are improved, the energy is recycled and the operating cost is lowered; through the immobilized microorganism-aeration biological filter, the biological treatment effect is improved, and the operating cost for back end processing is lowered; the deep processing can ensure that the waste water is discharged by reaching the standard, and can meet the requirement to the upgrade and reorganization of sewage treatment plants when the environment protection standard is improved in the future. The invention has the purpose that the processing technique not only is applicable to the treatment for the waster water containing antibiotic and the upgrade and reorganization of the prior engineering of sewage disposal, but also is applicable to the engineering of sewage disposal and other sewage disposals with high salt content, high sulfate radical content, high ammonia and nitrogen content, high COD content and higher concentration organic matter which is hard to be degraded.