NOVELTY - A natural gas desulfuration and decarbonization system comprises natural gas filtration separation system, solution absorption system, flash concentration system, and solution regeneration system sequentially connected.    USE - Natural gas desulfuration and decarbonization system used for stripping coupled acid gas (claimed).    ADVANTAGE - The system solves the problems of unstable operation, large solvent loss and too large size of recovered sulfur, reduces acid gas quantity by 20-45% under the condition that the same product gas indexes are reached, and reduces size of corresponding downstream sulfur recovery devices and pipelines by 20-45%.    DETAILED DESCRIPTION - A natural gas desulfuration and decarbonization system comprises natural gas filtration separation system, solution absorption system, flash concentration system, and solution regeneration system sequentially connected. The natural gas filtration separation system comprises gravity separator and filter separator. The solution absorption system comprises absorption tower and wet purified gas washing tower. The flash concentration system comprises primary flash device, rich liquid heat exchanger, rich liquid heater and secondary flash device. The primary flash device comprises flash tank and flash column. The secondary flash device comprises flash tank, flash gas cooler and flash column. The solution regeneration system comprises regeneration tower connected to regeneration overhead reflux tank through top gas outlet condensate cooler, and regeneration column reboiler. The regeneration overhead reflux tank comprises liquid inlet and outlet connected through reflux pump. An INDEPENDENT CLAIM is included for stripping coupled acid gas from natural gas comprising:    (A) feeding sulfur-containing feedstock gas into gravity separator and into filter separator to separate and remove impurities to obtain pollution-free water and oil;    (B) adding into solution absorption system at 6-10 MPa to remove hydrogen sulfide gas, carbon dioxide gas and other impurities, feeding exhaust gas into wet purified gas washing tower, and washing with water;    (C) discharging 60-75 degrees C liquid into flash tank, steam flashing to 0.5-0.7 MPa, performing countercurrent contact with fuel gas system, feeding rich liquid and poor liquid into heat exchanger at 80-110 degrees C, heating rich liquid to 90-120 degrees C through heater, secondary steam flashing, cooling to 0.3-0.5 MPa, and performing countercurrent contact with fuel gas system or low pressure flare; and    (D) pumping rich liquid into solution regeneration system at 0.08-0.12 MPa, desorbing to carry out stripping of acid gas, discharging into condensate cooler, feeding into regeneration overhead reflux tank, separating liquid, pumping into regeneration tower while discharging separated acid gas into downstream acid gas treatment device, and passing through regeneration solution into regeneration column reboiler.