The invention discloses a block-chain-based distributed and partitioned power network data processing system and a method thereof. The system comprises at least one block chain autonomous system, at least one decision and control center communicatively connected with the at least one block chain autonomous system, and a plurality of data access bodies communicatively connected with the at least one block chain autonomous system, wherein the block chain autonomous system is composed of a plurality of data trusted nodes; the block chain autonomous system shares the technical data from the data access main body therein; the decision and control center obtains technical data from any data trusted node in the block chain autonomous system according to the granted service rights. The distributedand divided domain data processing method based on the block chain provided by the invention effectively improves the speed and efficiency of the block confirmation, improves the throughput of the system and reduces the system delay, saves the computing resources of nodes, and improves the confidentiality, integrity and usability of the technical data of the power network.