NOVELTY - Producing liquid ammonia liquefied natural gas using carbonization furnace gas system, comprises filtering carbonization furnace gas through a filter, removing a non-gaseous impurities from carbonization furnace gas, performing preliminary purification of carbonization furnace gas, compressing carbonization furnace gas, performing deoxidation and nitrogen separation of furnace gas, performing wide temperature sulfur-tolerant transformation, performing desulfurization and decarbonization and methanation, and performing liquefying step and ammonia synthesis.    USE - The method is useful for producing liquid ammonia liquefied natural gas using carbonization furnace gas system (claimed).    ADVANTAGE - The method is capable of economically producing liquid ammonia liquefied natural gas with purity of 99.5%.    DETAILED DESCRIPTION - Producing liquid ammonia liquefied natural gas using carbonization furnace gas system, comprises filtering carbonization furnace gas through a filter, removing a non-gaseous impurities from carbonization furnace gas, performing preliminary purification of carbonization furnace gas, compressing carbonization furnace gas using reciprocating compressors or centrifugal compressors at a pressure of 0.01-5 Mpa, performing deoxidation of carbonization furnace gas using deoxygenation catalyst, where the volume fraction of carbonization furnace is reduced to oxygen gas in an amount of 0.5%, performing nitrogen separation of carbonization furnace gas using vacuum pressure swing adsorption technology such that the volume fraction of the carbonization furnace gas is reduced to nitrogen gas in an amount of 1%, performing wide temperature sulfur-tolerant transformation by adding water vapor, adjusting volume ratio of carbonization furnace gas of hydrogen and carbon monoxide to (3.2-3.5):1 while producing carbonization furnace gas into hydrogen sulfide, performing desulfurization and decarbonization using N-methyldiethanolamine, polyethylene glycol dimethyl ether or methanol, performing washing of 0.1 ppm of sulfur containing carbonization furnace gas, where the reduced volume fraction of carbon dioxide is 0.3%, performing multi-stage methanation using nickel-based catalyst to obtain predominantly methane gas mixture by multi-level non-methanation process or belt loops adiabatic methanation process at a temperature of 250-700 degrees C and a pressure of 1-10 Mpa and then heating the reaction mixture for the production of steam, performing separation using molecular sieves to remove a gas mixture of predominantly methane and carbon dioxide in the water, reducing moisture content of carbon dioxide to 1-50 ppm, performing liquefying using cryogenic mixed refrigerant liquefaction technology to obtain greater than 99.5% pure methane, performing ammonia synthesis at pressure of 20-30 Mpa, and performing cold ammonia cooling step to -15 degrees C.