Perovskite　quantum　dots　(PQDs)　have　attracted　more　and　more　attention　in　light-emitting　diode　(LED)　devices　due　to　their　outstanding　photoelectric　properties.　Surface　ligands　not　only　enable　size　control　of　quantum　dots　but　also　enhance　their　optoelectronic　performance.　However,　the　efficiency　of　exciton　recombination　in　PQDs　is　often　hindered　by　the　desorption　dynamics　of　surface　ligands,　leading　to　suboptimal　electrical　performance.　In　this　study,　sodium　methanesulfonate　(NaMeS)　was　successfully　introduced　during　PQD　synthesis　and　ligand　exchange,　where　the　S=O　groups　effectively　interacted　with　the　perovskite　components.　The　NaMeS-modified　PQD　films　exhibited　significantly　improved　surface　morphology,　radiative　recombination　efficiency,　and　carrier　mobility.　Consequently,　Pe-LEDs　derived　from　NaMeS-capped　PQDs　achieved　a　remarkable　enhancement　in　performance　with　a　maximum　external　quantum　efficiency　of　9.41%.　This　work　thus　provides　a　novel　and　effective　strategy　for　the　development　of　high-performance　PQDs　and　their　applications　in　LEDs.