The invention discloses a three-pipeline gas relay detection station. The three-pipeline gas relay detection stationcomprises two oppositely arranged benches, a fuel tank, a basic pipeline, a first detection bypass, a second detection bypass, and a third detection bypass. Through the combination of the basic pipeline and the three detection bypasses, respectively, the cross-sectional area of the oil flow and the cross-sectional area of the to-be-measured gas relay are consistent to eliminate the dispersion of the oil flow on the oil flow impact received by the internal action element of the gas relay, thereby meeting the requirements for heavy gas flow rate detection of different types of gas relays having different caliber and different manufacturers at home and abroad; the three-pipelinegas relay detection station has the advantages of simple operation, high reliability, low labor intensity, high work efficiency, and high detection accuracy.