The utility model discloses an ammonia adaptive optimization controlling means is spouted in denitration relates to flue gas denitrification device technical field, spouts the rectangular equipartition of ammonia pipeline and arranges, the vertical denitration flue top entrance of locating, be located the denitration flue inside, every spouts ammonia pipeline top and all establishes one and spout ammonia flow automatic control, denitration import flue side wall cloth establishes laser absorption spectrum formula measuring device, and laser absorption spectrum formula measuring device locates and respectively spouts between ammonia pipeline and the catalyst layer, laser absorption spectrum formula measuring device is with wireless transmission's form and computer data intercommunication, the utility model discloses a laser absorption spectrum formula measuring device measures in the flue gas NH3 and NO's space concentration profile, acquires NH3 and NO's concentration field information, the ammonia pipeline is respectively spouted in control according to concentration field information the volume of spouting ammonia, and different spatial position's NH3 and NO homogeneous mixing in the assurance flue, denitration reaction do not receive NO spatial distribution inhomogeneities's influence, the escape of effective control ammonia.