With the development of the ground wire de-icing technology during transmission line non-power-off operations, the calculation of induced voltage has a significant impact on the ice-melting scheme. This paper utilizes the new unmanned aerial vehicle laser point cloud scanning technology to propose a method for calculating the induced voltage of grounding wires based on the extraction of 3D laser point cloud parameters, enabling rapid calculation of the induced voltage of ice-melting grounding wires under actual working conditions. An ice-melting test has been carried to verify the calculation model of induced voltage. The influence of parameters such as length of the icing section, load current was analyzed. The results show that when the current is constant, the induced voltage in the grounding wire approximately increases linearly with the length of the icing section. The research results can guide the formulation of ground wire de-icing schemes during transmission line non-power-off operations, and promote the development of de-icing technologies for local sections in micro-terrain areas.