NOVELTY - Device for producing methane rich gas by syngas, comprises a reactor (100) provided with a syngas inlet (101) on one end and a methane rich gas outlet (102) on the other end. The methanation catalyst zones (105) and adsorbent zones capable of adsorbing the carbon dioxide and sulfide gases and arranged with the methanation catalyst zones in crossing manner between the syngas inlet and the methane rich gas outlet and at least one adsorbent regenerator (200) is connected with the reactor by a waste adsorbent conveying pipeline and a regeneration adsorbent conveying pipeline.    USE - The device is useful for producing methane rich gas by syngas.    DETAILED DESCRIPTION - Device for producing methane rich gas by the syngas, comprises a reactor (100) provided with a syngas inlet (101) on one end, a methane rich gas outlet (102) on the other end. The N methanation catalyst zones (105) and N+1 adsorbent zones capable of adsorbing the carbon dioxide and sulfide gases and arranged with the methanation catalyst zones in crossing manner between the syngas inlet and the methane rich gas outlet, where N is an integer greater than or equal to 1, and at least one adsorbent regenerator (200) is connected with the reactor by a waste adsorbent conveying pipeline and a regeneration adsorbent conveying pipeline. The waste adsorbent produced in the reactor enters into the adsorbent regenerator through the waste adsorbent conveying pipeline, and is regenerated in the adsorbent regenerator, and subsequently the regenerated adsorbent is recycled to the reactor by the regeneration adsorbent conveying pipeline. An INDEPENDENT CLAIM is also included for producing the methane rich gas comprising transferring the syngas e.g. carbon monoxide, carbon dioxide, hydrogen, sulfide gas and optional steam into the reactor through the syngas inlet, passing the syngas transferred into the reactor through the first adsorbent zone, quickly adsorbing the carbon dioxide and sulfide gas from the syngas by using the adsorbent in the adsorbent zone to be removed or reduced, subsequently, passing the syngas through the first methanation catalyst zone, and producing methane, carbon dioxide and water under the catalysis of the methanation catalyst, passing the syngas through the second adsorbent zone subsequently, quickly adsorbing the residual carbon dioxide and sulfide gas from the syngas and/or the carbon dioxide produced in the reaction by using the adsorbent in the adsorbent zone to be removed or reduced, subsequently passing the syngas through the second methanation catalyst zone, and producing the methane, carbon dioxide and water under the catalysis of the methanation catalyst, and passing the syngas through the N methanation catalyst zones and N+1 adsorbent zones in the crossing manner, separating the methane rich gas from the carbon dioxide and sulfide gases leave the reactor from the methane rich gas outlet by absorbing the methane rich gas, making the waste adsorbent to leave the reactor through the waste adsorbent conveying pipeline, entering into the adsorbent regenerator, reacting the waste adsorbent entering into the adsorbent regenerator with the oxygen-containing flow at 500-1200 degrees C, converting into the regeneration adsorbent, and recycling the regeneration adsorbent to the reactor through the regeneration adsorbent conveying pipeline.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic representation of the device for producing methane rich gas by syngas.    Reactor (100)    Syngas inlet (101)    Methane rich gas outlet (102)    Methanation catalyst zones (105)    Adsorbent regenerator (200)