The invention provides a combined treatment method for ammonia chloride waste water through rare earth extraction separation. The method mainly comprises the steps that the waste water is subjected to a series of desalting and concentration treatment through oil separation, homogenizing, aerating, electric flocculation demulsification, degreasing through an air floating machine, precipitation of calcium, magnesium and heavy metal ions through chemical feeding, microfiltration, ultrafiltration, nanofiltration, reverse osmosis, electrodialysis, evaporation, concentration and the other processes, and then desalted and purified water capable of being utilized cyclically and ammonia chloride products conforming to agricultural standards are obtained. The waste water treatment process is mature, stable and low in treatment cost; production equipment is complete and easy to operate, and automatic industrial control can be easily achieved; zero emission and resource utilization in the treatment process of the ammonia chloride waste water, with different concentrations, generated through rare earth extraction separation are well achieved.