Membrane method decarburization system for natural gas

A natural gas membrane decarburization system relates to the technical field of natural gas decarburization, and comprises a gas inlet unit, a gas outlet unit, a decarburization unit, a decarburization unit and a decarburization unit which are connected in sequence, the pre-membrane purification treatment unit is used for removing impurities, oil and water in the raw material gas and eliminating gas fluctuation; the heating unit is used for heating the gas to ensure that the temperature of the raw material gas is within the ideal temperature range of the membrane, and the heating unit adopts a heater; the membrane module unit is used for separating raw material gas; the membrane post-treatment unit is used for treating trapped gas obtained after the raw material gas is separated, and the trapped gas is high-purity methane; pressure of natural gas is used as power, external power is not needed, carbon dioxide in the natural gas is removed, the purpose of purifying the natural gas is achieved, and energy is sav