The explosive development of mobile communications and networking has led to the creation of an extremely complex system, which is difficult to manage. Hence, we propose an AI-powered network framework that uses AI technologies to operate the network automatically. However, due to the separation between different mobile network operators, data barriers between diverse operators become bottlenecks to exploit the full power of AI. In this paper, we establish a mutual trust data sharing framework to break these data barriers. The framework is based on the distributed and temper-proof attributes of blockchain. We implement a prototype based on Hyperledger Fabric. The proposed system combines supervision and fine-grained data access control based on smart contracts, which provides a secure and trustless environment for data sharing. We further compare our system with existing data sharing schemes, and we find that our system provides a better functionality.