The　Industrial　Internet　of　Things　(IIoT)　is　considered　to　be　one　of　the　most　promising　revolutionary　technologies　to　increase　productivity.　With　the　refined　development　of　manufacturing,　the　entire　manufacturing　process　is　split　up　into　several　areas　of　IoT　production.　Devices　from　different　domains　cooperate　to　perform　the　same　task,　which　cause　security　problems　in　interacted　communication　among　them.　Existing　authentication　methods　cause　heavy　key　management　overhead　or　rely　on　a　trusted　third　party.　It　is　imperative　to　protect　privacy　and　ensure　the　credibility　of　the　device　during　device　interaction.　This　article　proposes　a　federated　hierarchical　trust　interaction　scheme　(FHTI)　for　the　cross-domain　industrial　IoT.　It　builds　a　low-privacy　network　platform　through　blockchain　and　protects　the　data　privacy　of　the　IIoT.　A　hierarchical　trust　mechanism　based　on　federated　detection　is　designed　to　realize　the　unified　trust　evaluation　of　cross-domain　devices.　A　trusted　cross-domain　method　based　on　device　trust　value　is　designed　to　ensure　the　security　and　trustworthiness　of　cross-domain　devices.　The　simulation　results　show　that　the　FHTI　scheme　can　improve　the　speed　of　identity　authentication　and　the　detection　accuracy　of　malicious　devices.　©　2014　IEEE.