Low-voltage line electricity stealing and leakage detection device and detection method thereof

The invention relates to the technical field of power monitoring and particularly relates to a low-voltage line electricity stealing and leakage detection device and method. The device comprises a telescopic rod, current iron cores, and a data processor, wherein the telescopic rod is telescopically arranged along the axial direction of the telescopic rod; the number of the current iron cores is four, and each current iron core comprises an upper half ring and a lower half ring; a first end of the upper half ring is rotationally connected with a first end of the lower half ring; a second end of the upper half ring is detachably connected with a second end of the lower half ring; a coil is wound on the upper half ring and/or the lower half ring; the bottom of each current iron core is provided with a connecting piece; each current iron core is detachably mounted on the top of the telescopic rod through a connecting piece; and an output end and an input end of the coil of each current iron core are connected wit