Anion selective separating membrane and application thereof

The invention discloses an anion selective separating membrane and application thereof. The separating membrane is prepared through the following method, and the method includes the steps that bromized polyphenyl ether and 1-methyl-2-pyrrolidone are mixed to be uniform to obtain a bromized polyphenyl ether solution; the bromized polyphenyl ether solution is applied to a glass plate, and the glass plate is put on a flat heater to be dried to obtain a bromized polyphenyl ether membrane; at the room temperature, the bromized polyphenyl ether membrane is soaked in a polyethyleneimine water solution for 8-24 h, taken out and flushed with deionized water to obtain a grafted bromized polyphenyl ether membrane; the grafted bromized polyphenyl ether membrane is soaked in a trimethylamine water solution for 24 h at the room temperature, taken out and dried to obtain the anion selective separating membrane. The anion selective separating membrane is simple in preparing process, only simple soaking is needed, the complex