NOVELTY - Purifying 7N electronic ultra-pure ammonia comprises: (a) sending the raw material liquid ammonia to gasifier; (b) intermittently gasifying; (c) highly-efficiently de-oiling; (d) deeply adsorbing and drying; (e) ppb-grade rectifying; and (f) terminally purifying the ammonia gas.    USE - The method is useful for purifying 7N electronic ultra-pure ammonia (claimed) applied to the industries such as semiconductor integrated IC, liquid crystal display LCD, semiconductor device LED and solar battery PV.    DETAILED DESCRIPTION - Purifying 7N electronic ultra-pure ammonia comprises: (a) sending the raw material liquid ammonia to gasifier: sending the industrial liquid ammonia with less oil content and with purity of 99.8% into the gasifier by liquid ammonia pump; (b) intermittently gasifying: intermittently gasifying the raw material by using two gasifiers connected in parallel, precisely controlling evaporation of liquid ammonia, and then controlling the water content in the gasified ammonia gas to be below 1% of water content in the industrial liquid ammonia; (c) highly-efficiently de-oiling: making the gasified ammonia gas into the high-efficient de-oiler, reducing the oil content to be below 0.1ppm; (d) deeply adsorbing and drying: deeply dehydrating, adsorbing and drying the de-oiled ammonia gas, controlling the water content of the ammonia gas to be in 1ppm; (e) ppb-grade rectifying: separating the light component and heavy component in the liquid ammonia from the dried ammonia gas by ppb-grade rectification tower, discharging the light components in the tower top condenser, reducing the H2, O2, N2, Ar, CH4, CO and CO2 in the ammonia to be below 10ppb, discharging the heavy components on tower bottom to the waste ammonia tank, reducing the metal ion in the ammonia to ppt number grade; and (f) terminally purifying the ammonia gas: finally making the ammonia gas enter into the terminal purifier to deeply dehydrate, wherein the terminal purifier use zirconium-vanadium-iron alloy as gas absorbing agent, controlling the water content in the purified product ammonia to be below 1ppb.