The utility model discloses a gas transmission & distribution voltage regulator, include valve body, pressure regulating cavity, pilot valve, high -pressure connecting pipe, work connecting pipe, pilot valve back pressure pipe, pressure release pipe, go up pressure regulating chamber back pressure pipe, the lower cavity and the valve body intercommunication of pressure regulating cavity, the highpressure connecting pipe is with the one -level throttle voltage reduction unit intercommunication of valve body upper reaches pipeline and pilot valve, pilot valve back pressure pipe is with the one-level throttle voltage reduction unit intercommunication of valve body low reaches pipeline and pilot valve, the natural gas and valve body low reaches pipeline intercommunication after one -level throttle that the work connecting pipe will pass through the pilot valve steps down, the pressure release pipe is with the galvanostat and valve body low reaches pipeline intercommunication of pilot valve, go up the last cavity and valve body low reaches pipeline intercommunication of pressure regulating chamber back pressure pipe with the pressure regulating chamber. The utility model discloses canavoid liquid triethylene glycol to get into the pressure regulating intracavity of voltage regulator to guarantee the precision of voltage regulator.