Abstract: This paper proposes an evaluation method based on non-contact magnetic-based stress detection to determine the safety status of buried natural gas pipelines. Firstly, a theoretical model of non-contact magnetic stress signal for buried ferromagnetic pipelines was established, and then the magnetic anomaly pipe section was identified through a self-developed non-contact scanning magnetometer. At the same time, the magnetic anomaly comprehensive index F value was defined to assess the degree of stress concentration. By combining with high consequences areas and geological disasters, the safety status of buried natural gas pipelines was determined. The excavation inspection of high-risk pipe sections was carried out through magnetic memory detection technology. The results show that three stress-concentrated pipe sections have been identified through non-contact magnetic stress detection technology. Among them, the safety status of the Ⅱ-level stress-concentrated pipe section is of high risk. The excavation test results verify the accuracy of the detection and evaluation results.