The　integration　of　information　systems　and　physical　systems　is　the　development　trend　of　today＇s　manufacturing　industry.　Intelligent　manufacturing　is　a　new　model　of　manufacturing,　based　on　advanced　manufacturing　technology　with　human-machine-material　collaboration.　Internet　of　Things　technology　is　the　core　technology　of　intelligent　manufacturing,　and　access　control　technology　is　one　of　the　main　measures　to　ensure　the　security　of　the　IoT.　In　view　of　the　problem　that　the　existing　IoT　access　control　model　does　not　support　distributed　and　fine-grained　dynamic　access　control,　this　paper　uses　the　characteristics　of　blockchain,　such　as　decentralization　and　non-tampering,　combined　with　the　attribute-based　access　control　(ABAC)　method,　to　propose　a　distributed　access　control　method,　applicable　to　the　IoT　environment　in　the　process　of　intelligent　manufacturing.　This　paper　describes　a　fine-grained　access　control　policy　by　defining　the　access　control　attribute　values　in　a　formal　language,　which　supports　complex　logic　operations　in　the　policy　and　enhances　the　expressiveness　of　the　model.　Distributed　access　control　decision　making,　using　smart　contracts　for　blockchain,　improves　the　decision-making　efficiency　of　the　access　control　model,　increases　the　post-facto　audit　of　the　access　control　behavior,　and　improves　the　overall　security　of　IoT　data　protection.　The　paper　concludes　with　proof　of　security　and　a　performance　analysis,　and　the　experimental　results,　such　as　storage　and　computing　overheads,　show　that　this　method　can　provide　fine-grained,　dynamic,　and　distributed　access　control　for　devices　in　intelligent　manufacturing,　ensuring　the　security　and　reliability　of　access　control　for　IoT　devices.