At present, landslide monitoring mainly involves two aspects: surface displacement monitoring and deep displacement monitoring, of which the latter could directly reflect the internal state of landslide, which is a research focus of landslide monitoring technology. In view of the problems of deep displacement monitoring technology, one-dimensional magnetic positioning technology was proposed in this article. In association with theory and experiment, the feasibility of using the technique in deep displacement monitoring of landslide was explored, and the relationship between deep displacement and magnetic induction intensity was deduced and verified by experiments. Finally, eight random points were selected to carry out position verification experiments. Result proves that it is feasible to apply one-dimensional magnetic positioning technology in landslide monitoring, and its positioning accuracy reached millimeter level, suitable for the requirement of landslide monitoring.