The invention discloses a non-intervention capacitive type gas pipeline leakage infrasonic wave detection device. The non-intervention capacitive type gas pipeline leakage infrasonic wave detection device comprises a magnetic substrate, a base, a protective shell, a stress separation membrane, a guide pipe, a membrane, double capacitors, a pre-amplifier, a voltage circuit and a signal output end. According to the non-intervention capacitive type gas pipeline leakage infrasonic wave detection device, the magnetic substrate is attracted and fixedly installed on the outer side of the pipe wall of a gas pipeline, and leakage is detected by sensing an infrasonic wave signal transmitted along a gas medium in the pipeline or an infrasonic wave signal transmitted along the pipe wall when the gas pipeline leaks. According to the specific process, the magnetic substrate is attracted on the pipe wall, the protective shell is tightly screwed to enable the stress separation membrane to be tightly attached to the pipe wall, the infrasonic wave signal transmitted along the gas medium or the infrasonic wave signal transmitted along the pipe wall is sensed, the guide pipe connected with the membrane enables the membrane to vibrate and move, then the double capacitors generate charges, and the signal is amplified by the pre-amplifier, converted into voltage through the voltage circuit and finally output by the signal output end.