The invention provides a movable type device for detecting burying, extrusion-off and leakage, caused by urban landslide, of a fuel gas tube, and belongs to the field of urban disaster prevention andreduction and geological disaster control. The device is characterized in that an infrasonic wave sensing and detecting system collects an infrasonic wave signal at a breakage and leakage position ofa buried fuel gas pipeline to detect damage degree of the fuel gas pipeline. The device can be utilized to precisely detect leakage damage degree of the urban fuel gas pipeline buried as a result of unexpected mountain landslide, and can fore-warn and detect combustible gas leakage information of the buried pipeline in real time. Meanwhile, the device welds a moving system at the bottom end of a completely-protected supporting cover; and a plurality of rotary slide wheels and a ring-shaped soil shoveling machine are arranged, so that flatness of a detecting position of the device and movable type flexible detection in any area can be guaranteed, and therefore, probes can be guaranteed to be in contact with a rock-soil body at a short distance, and detection accuracy is guaranteed.