The　problem　of　vibration　and　noise　in　the　iron　core　of　power　transformers　remains　quite　topical.　Insofar　as　the　state-of-the-art　iron　core　and　binding　production　adopt　the　lamination　method　and　weft-free　adhesive　tape,　respectively,　the　transformer　core　vibration　is　mainly　attributed　to　the　silicon　steel　sheet　(SSS)　magnetostriction.　In　this　paper,　based　on　the　magnetostriction　of　grain-oriented　SSS,　an　in-depth　analysis　of　the　vibration　generation　mechanism　in　the　transformer　core　was　performed.　The　SSS　microstructure　was　observed,　its　magnetostrictive　properties　at　different　magnetic　flux　densities　were　tested,　and　a　core-simulating　four-corner　iron　core　model　was　constructed　to　analyze　the　vibration　characteristics.　Modal,　vibration,　and　noise　tests　were　performed　on　an　actual　110　kV　transformer　core　under　no-load　conditions.　The　results　show　that　the　core　vibration　is　related　to　SSS＇s　deformation　mechanism.　The　vibration　magnitude　in　different　core　parts　varies　due　to　the　magnetostriction　anisotropy.　The　vibration　in　vertical　to　the　core　plane　is　the　largest,　and　its　magnitude　in　the　core　center　is　lower　than　those　at　the　seams　in　the　same　plane.　The　core　vibration　and　noise　exhibit　a　significant　correlation,　while　modal　characteristics　strongly　influence　the　core　vibration　and　noise　intensity.　©　2021　He　Qiang　et　al.