Clean preparation method of glufosinate-ammonium

The invention discloses a clean preparation method of glufosinate-ammonium, and aims to solve the problems that in the prior art, through hydrolysis of aminonitrile acid, equipment corrosion is serious, the amount of three wastes (waste gas, waste water and industrial residue) is large, and the existing product purification method has too low yield, complicated operation or high cost. The method comprises the following steps: preparing glufosinate sodium salt by adopting basic hydrolysis of aminonitrile, introducing carbon dioxide and ammonia gas, or directly adding NH4HCO3 into an aqueous solution of the glyphosate sodium salt, carrying out filtering separation on NaHCO3, and concentrating the filtrate to obtain an aqueous solution of glufosinate-ammonium or carrying out further concentrating and crystallization to obtain the glufosinate-ammonium; while by-product sodium bicarbonate can be further processed into sodium bicarbonate or sodium carbonate. With the preparation method provided by the invention, th