The present invention discloses an oil and gas pipeline displacement monitoring device. The oil and gas pipeline displacement monitoring device includes a dynamic pile and a foundation pile; a first mounting platform is fixed on the dynamic pile; the first mounting platform is provided with a first reflector; a second mounting platform is fixed to the foundation pile; the second mounting platform is provided with a beam splitter, a laser, a second reflector and a photo detector; the beam splitter, the laser, the second reflector, the photo detector and the first reflector form a Michelson interferometer; the lower end of the dynamic pile is fixedly connected with a clamping hoop; the clamping hoop is mounted at the outer circumference of an oil and gas pipeline; and the foundation pile is fixedly mounted at one side of the oil and gas pipeline. According to the oil and gas pipeline displacement monitoring device of the invention, the Michelson interference method is adopted to detect the displacement of the oil and gas pipeline; the photo detector obtains a measurement result, and therefore, a precision guarantee can be provided; and an acquisition unit inputs measured data to a processing unit, so that the measured data can be processed in the processing unit. The oil and gas pipeline displacement monitoring device has the advantages of high measuring precision, high automation degree, operation simple and the like, and can achieve real-time monitoring.