The invention discloses a parallel pipeline interference elimination method in a buried pipeline AC/DC stray current detection. The parallel pipeline interference elimination method relates to the technical field of detection, and is characterized in that two sets of three-magnetic saturation magnetometer probe arrays are adopted for eliminating parallel pipeline magnetic field interference and external stable magnetic field interference during detection of AC and DC mixed stray currents in the pipeline, thus the method for precisely detecting stray currents in a lower pipe of parallel pipelines. The parallel pipeline interference elimination method has the beneficial effects that the two sets of three-magnetic saturation magnetometer probe arrays are employed for detecting a magnetic field generated by the parallel pipeline currents, calculation and elimination of interference of the external stable magnetic field and the parallel pipeline current magnetic field are achieved, and on the basis, pipeline burial depth detection and current detection in the parallel pipelines can be achieved; furthermore, detection of AC and DC mixed stray currents in the pipelines is realized, and the AC and DC stray currents are separated, so as to evaluate interference conditions of the pipelines from an alternating-current interference source and a direct-current interference source respectively.