The invention discloses a method for co-producing synthesis of ammonia through burning high-concentration waste water by using the CWS (Coal Water Slurry) technology, which comprises the following steps that: the high-concentration waste water is pretreated firstly so as to prepare coal water slurry; the prepared coal water slurry with a concentration of 50 to 65 percent and pure oxygen subjected to space division are sprayed into a gasifier together, and then subjected to gasification and cracking reactions at a temperature of 1350 to 1450 DEG C and under the pressure of 1.1 to 1.3 MPa so as to generate water gas comprising CO and CO2, H2, N2 and a little of hydrogen sulfide; the CO is reacted with water vapor through a transformation process so as to generate CO2 and H2; then a little of hydrogen sulfide is removed by wet desulphurization through a desulphurization process; part of obtained gases are used for removing the CO2 and simultaneously generating ammonium bicarbonate through a carbonization process; and the other part of obtained gases are prepared into high-purity hydrogen through a PSA hydrogen extraction process. The prepared high-purity hydrogen is used for preparing PBH (potassium borohydride), and part of the high-purity hydrogen is mixed with high-purity nitrogen subjected to space division, then the obtained mixture is used for producing synthesis ammonia through a synthesis process and then prepared into finished liquid ammonia. The invention has the characteristics of simple process and no secondary pollution, and can be used cyclically and comprehensively.