The utility model discloses a produce device of front three amine gas body during preparation alkali ion -exchange fiber arranges annular duct in its intermediate layer, be equipped with inlet I, inlet II and air inlet on the lateral wall of inner shell, and the shell liquid outlet communicates with the liquid storage pot of bottom, liquid storage pot and inner shell intercommunication, the device outside sets up three aqueous methylamine solution storage tanks, liquid outlet pipe that its bottom set up and I intercommunication of the inlet of annular duct and inner shell. The utility model discloses a produce the device of the front three amine gas body, adoption solid trimethylamine hydrochloric acid is as the source that produces the front three amine gas body, be convenient for transportation and storage, utilize alkali to be dissolved in the heat that a large amount of heat of three aqueous methylamine solution release and alkali and trimethylamine hydrochloric acid take place neutralization reaction release, make the front three amine gas body that produces with the back in trimethylamine and the trimethylamine hydrochloric acid among three aqueous methylamine solution release make full use of reaction system's self heat of solution and the heat of neutralization reaction production, effectively energy saving as far as possible from the system.