Aiming　at　the　problems　of　the　traditional　centralized　data　sharing　platform,　such　as　poor　data　privacy　protection　ability,　insufficient　scalability　of　the　system　and　poor　interaction　ability,　this　paper　proposes　a　distributed　data　sharing　system　architecture　based　on　the　Internet　of　Things　and　blockchain　technology.　In　this　system,　the　distributed　consensus　mechanism　of　blockchain　and　the　distributed　storage　technology　are　employed　to　manage　the　access　and　storage　of　Internet　of　Things　data　in　a　secure　manner.　Up　to　the　physical　topology　of　the　network,　a　hierarchical　blockchain　network　architecture　is　proposed　for　local　network　data　storage　and　global　network　data　sharing,　which　reduces　networking　complexity　and　improves　the　scalability　of　the　system.　In　addition,　smart　contract　and　distributed　machine　learning　are　adopted　to　design　automatic　processing　functions　for　different　types　of　data　(public　or　private)　and　supervise　the　data　sharing　process,　improving　both　the　security　and　interactive　ability　of　the　system.　©　2021,　Science　in　China　Press.　All　rights　reserved.