Abstract: This paper proposes an intelligent monitoring and early warning scheme for work near live equipment in substations by integrating three-dimensional modeling based on laser point clouds with BeiDou RTK dynamic positioning technology. A high-precision safety clearance monitoring system featuring site-wide coverage and real-time response is established to achieve graded early warning of operational risks and closed-loop management and control throughout the entire work process. The proposed scheme effectively mitigates safety hazards associated with work near live equipment and improves the level of safety management and control during the expansion, renovation, and maintenance of in-service substations. It has significant engineering application value for ensuring the stable operation of power grid equipment and preventing safety accidents in power construction.