Domain-wall-pinning　is　one　of　the　ways　to　realize　magnetic　hardening　for　permanent　magnet　materials.　The　sintered　2:17　Sm-Co　magnets,　a　most　typical　pinning-controlled　magnet,　have　complex　nano-scaled　cellular　structures　including　cellular　matrix　phase,　cell　wall　phase,　and　lamellar　Zr-rich　phase.　In　this　paper,　a　multiple　domain-wall-pinning　with　cell　wall　phase　dominating　and　Zr-rich　phase　participating　was　proposed　through　micromagnetic　simulation.　The　simulation　results　were　supported　by　magnetic　domain　observation　and　macroscopic　magnetic　measurement　analysis,　which　provided　a　key　reference　for　the　correlation　between　the　magnetic　properties　and　microstructure　of　this　kind　of　magnet.　Furthermore,　the　squareness　of　the　demagnetization　curve　for　the　magnet　was　affected　by　multiple　pinning,　including　multiple　pinning　phases　and　the　internal　inhomogeneity　inside　a　pinning　phase.　Our　finding　can　enrich　the　magnetic　hardening　mechanism　and　provide　theoretical　guidance　for　the　optimization　of　magnetic　properties　of　the　pinning-controlled　permanent　magnets.　©　2023