<p>As the crucial element of the Industrial Internet of Things (IIoT), the great number of data necessitates data sharing to realize the interconnection of various industrial elements. During the sharing, how to preserve privacy is of prime importance. Proxy re-encryption (PRE) solution is suitable for resource-restricted devices’ cross-domain data secure sharing in the form of ciphertext. However, the existing PRE may suffer a single point of failure because of a semi-trusted proxy server and collusion or quantum attack. To this end, an architecture that combines lattice-based revocable proxy re-encryption with blockchain scalability solutions is designed. Blockchain is responsible for storing and distributing re-encrypted key shares. The lattice-oriented PRE is introduced to check an agent server with misconduct that delivered a counterfeit converted cyphertext share and achieve post-quantum security. Moreover, aiming at guaranteeing security and improving the transmission efficiency of the re-encrypted key shares onto the blockchain, a scalable network transmission model based on the Kademlia-improved as well as data compression of Chinese Remaining Theorem-based is designed. Theoretic analysis is verified by the decisional learning with error (LWE) difficulty hypothesis. The experimental results show that the communication overhead is improved by 80% compared to the original broadcast mechanism.</p>