Abstract: in view of the problems such as the lag of spatial conflict prediction, the fragmentation of construction data, and the difficulty of operation and maintenance traceability in urban power grid reconstruction and complex distribution network projects with multi branch lines, this paper builds a full cycle digital management and control system based on BIM 3D modeling technology. This paper disassembles the three-dimensional parametric modeling logic of multi type equipment in the distribution network, establishes the quantitative calculation model of spatial collision verification, designs the closed-loop control module of planning, construction and operation and maintenance in stages, and carries out the landing verification combined with the urban complex distribution network reconstruction project. The measured data show that the accuracy of model space conflict identification, on-site construction deviation control, and the efficiency of digital archiving of as built data are optimized. The system can reduce the multi-stage coordination error of distribution network engineering, and provide a digital implementation path for the refined management and control of complex grid engineering.