Abstract: Ammonium fluoride is a kind of important inorganic fluoride，which attracted more and more attentions along with the development of inorganic fluoride chemical industry.Various ammonium fluoride production processes，including gas phase method，sublimed method，and liquid phase method were introduced，and liquid phase method was divided into neutralization method and ammonia decomposition method.The process of ammonium fluoride production with the by-product fluosilicic acid of phosphate fertilizer production was introduced in detail，and its advantages and disadvantages were analyzed.The research and development direction of ammonium fluoride was also pointed out.

Key words: ammonium fluoride, ammonification method, fluosilicic acid