Abstract: The cuprous chloride production process by sponge copper oxidative-decomposed from ammonium nitrate was introduced and technological process was as follows：adding sponge copper into the mixture of ammonium nitrate and sulfuric acid，and dissolved the copper in sponge copper to obtain copper sulfate solution；to join ammonium sulfite and ammonium chloride into the copper sulfate solution，and then ammonium sulfite reduced copper sulfate into the copper sulfite，and ammonium chloride make the copper sulfite into the cuprous chloride precipitation；finished cuprous chloride product was finally got by pickling，alcohol washing，and drying；By-product ammonium sulfate also obtained by evaporation and concentration to the filtrate.The best preparation conditions were obtained：1）In the sponge copper dissolving process，reaction temperature was 60 ℃，sulfuric acid concentration was at 0.2~0.3 mol/L，the amount of ammonium nitrate was excess of 10%~20%；2）In the precipitation process of cuprous chloride，amount-of-substance ratio of ammonium sulfite and copper sulfate was 0.6，and amount-of-substance ratio of ammonium chloride and copper sulfate was 1.0~1.1；3）Using sulfuric acid aqueous solution with mass fraction of 2% to wash the cuprous chloride precipitation，and then washing with ethanol with the mass fraction of 95%，and finally drying cuprous chloride to get products.The product quality was in line with the GB/T 27562—2011 Industrial Cuprous Chloride requirements.

Key words: ammonium nitrate, oxidative decomposition, copper sulfate, cuprous chloride