The invention discloses a government affair information resource sharing system based on a block chain, and belongs to the technical field of information sharing based on the block chain. By combiningP2P network, the cryptology and the artificial intelligence theory, the overall model architecture based on the block chain technology is provided, so that a government affair information resource sharing and exchange network system, a government affair information resource sharing and exchange block chain directory system, a certificate and trust system and an information resource sharing security intelligent exchange system are constructed. The government affair information sharing and exchanging system effectively solves the problems of trust islands, data ownership, peer-to-peer management, standard consistency, non-real-time exchange and the like in government affair information resource sharing application, and is high in safety, trustable, real-time exchange, data standard consistency, traceability and wide in sharing range.