The utility model discloses an interval firefighting pipeline's of subway connection structure, its characterized in that: it arranges to be the contained angle between the pipeline, the contained angle arrange be through junction between the pipeline sets up flexible clamp and realizes, the contained angle sum of a plurality of pipeline enclosure is identical with the tunnel radian. The utility model has the advantages that: the connection structure of this pipeline can make whole firefighting pipeline possess certain counter -bending and shock resistance, has reduced fire control pipeline under pressure because the tunnel is crooked or vibrations produce the moment of torsion and take place the whole pipeline problem of booster even of leaking to greatly reduced in the tunnel aging rateof firefighting pipeline system, avoid risk for the operation of whole subway trade, and produce certain economic benefits.