With the acceleration of constructing ultra-high voltage (UHV) power grids, the integrated operation characteristics of power grids become increasingly distinct. As a core link connecting several systems, the overhaul planning system witnesses greatly increased tasks. Accordingly, power grid operation requires the overhaul planning system to update its data exchange service and data sharing service. This study determines the Dcloud-based multi-level data sharing mechanism of the overhaul planning system. Further, it designs and integrates data exchange service, data sharing service, message pushing service, and data encryption and management service, forming a multi-level data sharing application. The practical application shows that the multi-level data sharing mode enhances the data interaction efficiency of overhaul plans, ensures data security, and improves data sharing.