NOVELTY - Integrated biological desulfurization device comprises a tower body comprising an upper desulfurization tower (3) and a lower desulfurization tower (16) separated from each other, a spray system and a reflux system. A marsh gas outlet (1) is formed at the top of the upper desulfurization tower. The spray system comprises a spray head (2) mounted at the upper part of the inner chamber of the upper desulfurization tower and a conveying pipe (23) located at the outer side of the tower body, where two ends of the conveying pipe are respectively connected with the spray head.    USE - The device is useful for marsh gas.    ADVANTAGE - The device is safe to use and monitors the process parameters at real time.    DETAILED DESCRIPTION - Integrated biological desulfurization device comprises a tower body comprising an upper desulfurization tower (3) and a lower desulfurization tower (16) separated from each other, a spray system and a reflux system. A marsh gas outlet (1) is formed at the top of the upper desulfurization tower. The spray system comprises a spray head (2) mounted at the upper part of the inner chamber of the upper desulfurization tower and a conveying pipe (23) located at the outer side of the tower body, where two ends of the conveying pipe are respectively connected with the spray head in the upper desulfurization tower and the inner chamber of the lower desulfurization tower. The conveying pipe is provided with a circulating pump. The reflux system comprises reflux pipe located at the outer side of the tower body, and the two ends of the reflux pipe are respectively connected with the bottom of the inner chamber of the upper desulfurization tower and the inner chamber of the lower desulfurization tower.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic representation of the integrated biological desulfurization device.    Marsh gas outlet (1)    Spray head (2)    Upper desulfurization tower (3)    Lower desulfurization tower (16)    Conveying pipe (23)