NOVELTY - Feeding system for producing marsh gas via straw fermentation comprises a feeding tank (4), a secondary feeding tank (20), a positive pressure tank (11), a negative pressure tank (14), and an air compressor (12).    USE - The feeding system is useful for producing marsh gas via straw fermentation (claimed).    ADVANTAGE - The feeding system can effectively prevent the strew blockage in the pipeline and completely conveying the raw materials in the anaeroic digestor in order to ensure enough raw materials in the anaeroic digestor and ensure the yield of the marsh gas.    DETAILED DESCRIPTION - Feeding system for producing marsh gas via straw fermentation comprises a feeding tank (4), a secondary feeding tank (20), a positive pressure tank (11), a negative pressure tank (14), and an air compressor (12); where the feeding tank (4) is connected with a strew mixing pool (1) via a pipeline (2); a valve (3) is provided on the pipeline (2); the feeding tank (3) is connected with an anaeroic digestor (8) via a pipeline (7); a valve (6) is provided on the pipeline (7); the feeding tank (4) is connected with the positive pressure tank (11) via a pipeline (10); a valve (9) is provided on the pipeline (10); the feeding tank (4) is connected with the negative pressure tank (13) via a pipeline (17); a valve (16) is provided on the pipeline (17); the feeding tank (4) is connected with the secondary feeding tank (20) via a pipeline (18); a valve (19) is provided on the pipeline (18); the secondary feeding tank (20) is connected with the positive pressure tank (11) via a pipeline (15); a valve (14) is provided on the pipeline (15); the secondary feeding tank (20) is connected with the negative pressure tank (13) via a pipeline (22); a valve (21) is provided on the pipeline (22); the positive pressure tank (11) and the negative pressure tank (13) are connected with the air compressor (12), respectively.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the feeding system.    Strew mixing pool (1)    Pipeline (2)    Feeding tank (3, 4, 7, 10, 15, 17, 18, 22)    Level meter (5)    Valve (6, 9, 16, 19, 21)    Anaeroic digestor (8)    Positive pressure tank (11)    Air compressor (12)    Negative pressure tank (13, 14)    Secondary feeding tank (20)