NOVELTY - Biogas desulfurization pressure controlling device comprises a desulfurization shell (1) which is interconnected to a hanging plate (2). The two ends of the desulfurization shell are respectively provided with an upper bottle port (3). A lower bottle port (4) is set with clapboard (5). The two sides of clapboard are respectively provided with a U-shaped air inlet cavity and an air outlet cavity. One end of the air outlet cavity and air inlet cavity are respectively provided with an air inlet and an air outlet. The other end of the lower bottle port is connected to an air inlet control switch.    USE - Used as a biogas desulfurization pressure controlling device.    ADVANTAGE - The device displays pressure more accurately, has high desulfurization efficiency, can easily replace the desulfurizer, is easy to install, and has long service life.    DETAILED DESCRIPTION - Biogas desulfurization pressure controlling device comprises a desulfurization shell (1) which is interconnected to a hanging plate (2). The two ends of the desulfurization shell are respectively provided with an upper bottle port (3). A lower bottle port (4) is set with clapboard (5). The two sides of the clapboard are respectively provided with a U-shaped air inlet cavity and an air outlet cavity. One end of the air outlet cavity and the air inlet cavity are respectively provided with an air inlet and an air outlet. The other end of the lower bottle port with the air inlet cavity is fixedly connected to an air inlet control switch. The air inlet control switch is set on the hanging plate. The air outlet cavity is connected to the three-way outlet pipe by a lower interface. The three-way outlet pipe is connected to an upper interface and a sealed column by a pressure gauge. The upper and lower interfaces of the are provided with a side joint.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic representation of the biogas desulfurization pressure controlling device.    Desulfurization shell (1)    Hanging plate (2)    Upper bottle port (3)    Lower bottle port (4)    Clapboard (5)