The　rapid　and　accurate　positioning　of　transmission　cables　is　crucial　for　ensuring　the　stable　operation　of　power　systems　and　improving　the　efficiency　of　cable　fault　repairs.　However,　existing　transmission　cable　positioning　technologies　generally　have　defects　such　as　low　positioning　accuracy,　high　algorithm　complexity　and　significant　application　limitations,　which　weaken　their　effectiveness　in　practical　applications　to　some　extent.　In　view　of　this,　a　fast　positioning　method　for　three-phase　cable　is　proposed　in　this　paper,　and　the　relationship　between　the　magnetic　induction　intensity　around　the　three-phase　cable　and　the　distance　from　the　geometric　center　of　the　cable　is　derived.　By　combining　a　triaxial　magnetic　sensor　array　for　magnetic　detection,　the　location　information　of　the　three-phase　cable　can　be　determined,　enabling　its　precise　positioning.　Finally,　the　feasibility　of　this　method　is　verified　through　C　OMSOL　simulation　a　nd　experiments,　which　has　certain　engineering　application　value.　©　2025　IEEE.