The invention discloses a membrane method ammonia gas treatment recovering apparatus. The apparatus comprises a fore assembly and an ammonia gas absorbing assembly, the ammonia gas absorbing assembly comprises a membrane element, an ammonia water storage tank, an ammonia water pipeline heat exchanger, a circulating pump and a pressure reducing valve, the membrane element comprises a gas inlet, a gas outlet, a water outlet and a water inlet, and the ammonia gas absorbing assembly comprises at least two absorption stages. The invention also discloses a membrane ammonia gas treatment recovering technology for the ammonia gas treatment through adopting the apparatus. The membrane ammonia gas treatment recovering technology has the following advantages: a tail gas obtained after the absorption of the ammonia gas through the multi-stage membrane method apparatus can be discharged in a standard reaching manner, and the concentration of recovered ammonia water is high and is above 20%; and an absorbent can be used for the technological production or can be sold as a chemical engineering product after the concentration increase through cycle use.