System for preparing LNG (Liquefied Natural Gas) by converting and decarbonizing gasified coke tail gas

The utility model provides a system for preparing LNG (Liquefied Natural Gas) by converting and decarbonizing gasified coke tail gas, which is characterized in that a gasified coke tail gas compression device is connected with a gasified coke tail gas deoiling and naphthalene-removing device, and the gasified coke tail gas deoiling and naphthalene-removing device is connected with a gasified coke tail gas debenzolization and deamination device; the gasification coke tail gas sulfur-tolerant shift device and the shift gas wet decarburization device are connected into a whole through the shift gas desulfurization device, the other end of the shift gas wet decarburization device is connected with the mixed gas fine desulfurization device through a pipeline III, and the other end of the mixed gas fine desulfurization device is connected with the mixed gas methanation device; the mixed gas methanation device is connected with the methanation gas cryogenic separation device; the gasified coke tail gas debenzolizati