Pressure relief assembly of rural septic tank

The utility model belongs to the technical field of septic tank pressure relief assemblies, and discloses a rural septic tank pressure relief assembly which comprises a pressure relief component, the pressure relief component comprises a valve body part and a valve element part reciprocating relative to the valve body part, a first valve cavity and a second valve cavity are formed in the valve body part, and the first valve cavity and the second valve cavity are communicated with each other. After the air inlet pipe penetrates through the cement board, the two screw rings on the air inlet pipe are rotated, so that the two screw rings drive the two moving rings to move on the air inlet pipe until the two moving rings abut against the two sides of the cement board respectively, and the cement board is fixed through the air inlet pipe. And the device can be adjusted according to the thickness of the cement board by adjusting the positions of the moving rings, and the device can be used for the cement boards with