Based on multi-view 3D reconstruction technology, this paper proposes a volume monitoring method for irregular shaped ice, aiming to overcome the limitations of traditional icing monitoring for transmission lines. By using COLMAP and ACMM algorithms to achieve dense point cloud reconstruction, the reconstruction accuracy of weak texture areas is effectively improved. Subsequently, point cloud clipping and Poisson reconstruction algorithms based on plane projection are adopted to ensure the accuracy of ice cover volume calculation. The experiment verified the applicability of this method in practical scenarios, which can measure ice cover density with high accuracy. The experimental results show that it has strong practical application value in the actual winter overhead wire environment.