The invention discloses a concise glufosinate ammonium synthesizing method and aims at solving the problem that an existing method needs to use toxic sodium cyanide to synthesize glufosinate ammonium.Being different from an existing method of using diethyl methyl phosphite to prepare the glufosinate ammonium, the concise glufosinate ammonium synthesizing method disclosed by the invention can effectively avoid using toxic chemicals; thus, the problem of using the sodium cyanide is solved. By means of the synthesizing method, use of toxic chemicals is reduced, operation steps are simplified, equipment investment is reduced, the amount of three wastes is reduced, a requirement for clean production is met, and more environmental friendliness is achieved. Meanwhile, the synthesizing method disclosed by the invention not only can synthesize racemate glufosinate ammonium, but also can synthesize optical pure-chirality glufosinate ammonium, so that the synthesizing method has obvious progressive significance. According to the synthesizing method disclosed by the invention, technique connection is orderly, no solid material is used, convenience in operation is achieved, a technological process is simple, automatic production is achieved, labor intensity of workers is greatly reduced, and a production efficiency is improved; thus, the synthesizing method has a better application prospect and is worth of popularizing and applying in a large scale.