The invention discloses an ammonia gas crystallization treatment technology, and belongs to the technical field of environmental protection and the chemical engineering. The technology thoroughly solves a problem of secondary pollution generated by ammonia gas discharge treatment in the production process in the LED industry at home and abroad. The main equipment of the ammonia gas crystallization treatment technology (system) comprises a reaction tower, a water washing tower, a fan, a reaction crystallization liquid storage tank, a cooling crystallization liquid storage tank, an ammonium sulfate solution recovery and storage tank, a water washing water storage tank, a dehydration device, a reaction tower circulating pump, an ammonium sulfate water circulating pump, a water washing tower circulating pump, a sulfuric acid storage tank, a metering pump and a system control cabinet. The technology has the following advantage: an ammonia gas enters the system reaction tower and fully contacts with a sulfuric acid solution, the ammonia gas and the sulfuric acid solution undergo a crystallization reaction, the obtained ammonium sulfate solution and crystals enters a cooling crystallization device, and the gas enters the water washing tower and undergoes water washing and absorbing treatment, so the zero discharge of the ammonia gas and the zero discharge of ammonia-nitrogen wastewater are guaranteed. No generation of three wastes is reached in the whole ammonia gas treatment process, so the technology makes a significant contribution to the ammonia gas treatment in the LED industry at home and abroad.