Gas pipeline leakage detecting method and device

The invention discloses a gas pipeline leakage detecting method and device. The method comprises the following steps that the combustible gas concentrations of underground spaces surrounding a plurality of gas pipelines are detected; whether the combustible gas concentrations meet a leakage condition or not is determined; and if the leakage condition is met, it is determined that leakage happens to the gas pipelines, and a current leakage position is obtained and reported. By means of the method, whether leakage happens to the gas pipelines or not is determined according to the combustible gasconcentrations of the underground spaces surrounding the multiple gas pipelines, the current leakage position is obtained and reported when leakage happens, rapid and scientific positioning of a leakage point of the gas pipelines is realized, accurate prediction can be carried out with the combustible gas leakage maximum influence scope, and daily safety maintenance of a gas pipeline network andemergency disposal of a le