Although　wireless　sensor　networks　(WSNs)　are　widely　used　in　many　fields,　such　as　industrial　production,　medical　studies,　and　environmental　monitoring,　they　are　vulnerable　to　various　security　problems.　This　study　proposes　a　WSN　node　access　authentication　protocol　based　on　trusted　connection　architecture　to　prevent　easy　node　capture　and　various　malicious　attacks　as　well　as　to　address　the　limited　energy　and　computing　power　and　different　levels　of　node　credibility　in　WSNs.　First,　each　node　of　a　WSN　is　configured　using　a　trusted　platform　module　to　ensure　complete　key　generation　and　safe　storage,　and　thus　provides　security　for　the　access　protocol.　Second,　an　alarm　mechanism　is　introduced　to　avoid　cluster　node　issues,　such　as　not　forwarding　data,　forwarding　part　of　the　data,　and　forwarding　wrong　data.　This　mechanism　enhances　the　troubleshooting　capability.　Finally,　during　node　access,　bidirectional　node　identity　authentication,　platform　identity　authentication,　and　platform　integrity　verification　are　performed　to　achieve　trusted　node　access.　Our　protocol　is　formally　verified　using　Syverson-Van　Oorschot　(SVO)　logic.　The　security　features　are　applied　to　analyze　the　protocol,　and　back-end　analysis　modules　such　as　On-the-fly　Model-Checker　(OFMC)　and　Constraint　Logic　based　Attack　Searcher　(CL-AtSe)　of　the　Automated　Validation　of　Internet　Security　Protocols　and　Applications　(AVISPA)　tool　are　used　to　test　the　protocol.　The　theoretical　analysis　and　test　results　show　that　the　established　security　target　of　the　protocol　can　resist　network　attacks　in　real　application　scenarios.　In　addition,　the　implementation　efficiency　of　the　protocol　is　sufficiently　analyzed　and　evaluated.　The　results　show　that　the　protocol　has　high　execution　efficiency.　In　particular,　the　protocol　is　suitable　for　WSNs　with　high　security　requirements　and　limited　computing　power.