Abstract: In order to improve the intelligent management level of transmission high-voltage cable marker posts, a smart marker post device integrating status monitoring and warning is designed to address the problem of traditional marker posts lacking real-time monitoring and warning capabilities. By constructing a layered architecture of perception layer, network layer, and platform layer, combined with AI visual recognition, fault localization algorithms, and multi-source data fusion technology, real-time monitoring of cable status, abnormal warning, and precise defect localization have been achieved. Tests have shown that the device significantly improves the safety and maintenance efficiency of the power grid, providing technical support for the construction of smart grids.