Buried-steel-pipeline-based magnetic anomaly extraction and interpretation method

The invention provides a buried-steel-pipeline-based magnetic anomaly extraction and interpretation method. The buried-steel-pipeline-based magnetic anomaly extraction and interpretation method comprises the following steps: measuring magnetic induction intensity of the pipeline in an axial direction, alleviating outside interference anomaly and calculating a hazard index F, classifying anomaly level of a magnetic anomaly pipe section by combining the hazard index F, primarily judging defect type and establishing a model, forward modeling the model, determining the hazard defect position coordinate of the magnetic anomaly pipe section and forecasting the defect development process. By virtue of the method, the resolution ratio can be improved; the false anomaly information caused by the outside interference can be effectively eliminated; the position of a stress concentrating area of a pipe body determined and the hazard defect can be identified according to the detected magnetic anomaly data, within allowable deviation range, the abnormal position of a magnetic field of the pipeline can be rapidly determined by moving a magnetometer along the pipeline axis, the stress change caused by local metal defect of the pipe body can be deduced by combining the defected parameter and the change of the hazard index, and thus finally realizing magnetic anomaly extraction and fine interpretation of the buried pipeline stress defect.