The invention provides a gas pipeline conducting system with a pipeline falling detecting function, which is used for connecting a pipeline of an automobile. The gas pipeline conducting system comprises a main pipeline; the main pipeline is provided with a quick connector which is inserted into the main pipeline; a disconnection detecting switch is arranged at the junction of the main pipeline and the quick connector; the disconnection detecting switch comprises a first electrode, a second electrode and a sliding part; the first electrode is provided with a metal spring plate; the sliding part is arranged below the metal spring plate, extends into the main pipeline and can vertically slide, and the sliding part upwards slides to drive the metal spring plate to upwards move so as to make the metal spring plate be in contact with the second electrode; the root of the sliding part is sleeved with a first sealing ring; and a round groove is provided with a limiting ring so that the first sealing ring is fixedly arranged in the round groove. The gas pipeline conducting system is simple in mounting and capable of conducting a gas pipeline and a circuit if only the quick connector is inserted to two ends of the main pipelines.