Digital transformation will promote the rapid progress of power digital space construction led by power data. Through the use of new digital information technology, we will give full play to the function of data integration and effectively support the construction of new power system. Data interconnection is the key link to release the value of data, but at present, there are still many urgent problems to be solved in the power digital spatial data sharing, such as the mismatch between data demand and data supply, weak security guarantee and so on. In order to study the security protection of power digital spatial information data sharing, according to the concept of privacy computing, a power digital spatial data security sharing model system based on privacy computing is designed. This model system has strong research and practical significance for realizing the secure circulation and sharing of new power system data.