Industry　4.0　intelligent　manufacturing　scenario　has　many　types　of　enterprises,　users,　roles　interconnected.　A　safe　and　reliable　access　control　mechanism　is　an　important　technology　to　ensure　efficient　information　sharing　in　all　aspects　of　manufacturing.　The　traditional　access　control　mechanism　in　engineering　has　problems　such　as　management　centralization　and　data　leakage.　Blockchain　is　a　new　application　mode　of　computer　technology,　which　could　empower　access　control　to　achieve　credible　and　secure　sharing　of　data　in　all　links.　But　most　blockchain-based　access　control　researches　focus　on　the　authorization　part　of　access　control,　without　considering　authentication　and　auditing,　which　actually　is　a　three-element　separation　problem.　Meanwhile,　the　access　control　authority　will　be　obtained　by　users.　If　the　authority　is　stored　on-chain,　the　privacy　will　be　transparent;　While　if　the　authority　is　stored　off-chain,　it　may　cause　the　centralized　management　problems.　This　paper　proposes　a　Trusted　Access　Control　Mechanism　for　Intelligent　Manufacturing　Based　on　Decentralized　Identifier(TACMIM_DID).　It　assigns　hierarchical　DID　identifier　to　enterprises,　users　and　resources　involved　in　all　aspects　of　intelligent　manufacturing,　in　order　to　realize　entity　trusted　identity　management.　Furthermore,　we　mark　the　access　control　authority　with　the　role　DID　identifier,　and　use　verifiable　credential　to　automatically　verify　the　access　control　authority.　Finally,　we　design　the　user　reputation　model,　where　the　average　user　unauthorized　level　and　the　number　of　user　unauthorized　access　are　used　as　indicators　to　evaluate　user　behavior.　By　auditing　user　behavior,　a　positive　cycle　is　realized　to　improve　user　unauthorized　access　behavior.　The　experimental　and　analysis　results　show　that　TACMIM_DID　can　achieve　better　security,　and　realize　customized　reputation　evaluation　of　user　access　behavior.