Hexagonal　ferrites　based　on　SrFe12O19　(SFO)　are　vital　materials　in　the　field　of　permanent　magnets,　valued　for　their　cost-effectiveness　and　reliable　magnetic　properties,　making　them　a　more　affordable　alternative　to　rare-earth　permanent　magnets.　This　study　focuses　on　understanding　the　doping　effects　of　commonly　used　elements　in　SFO　system.　DFT　calculation　results　show　that　doping　La　or　La-Co　can　enhance　the　phase　stability　of　SFO,　in　which　Co　has　a　preference　for　the　4f1　sites　of　Fe.　The　total　magnetic　moment　was　observed　to　slightly　decrease　with　La　doping,　whereas　it　exhibited　an　increasing　trend　with　La-Co　and　La-Ca-Co　co-doping　and　the　largest　increase　of　6.5%　can　be　obtained　in　Sr2LaCaFe44Co4O76　(SLCFCO).　The　increase　in　the　total　magnetic　moment　is　mainly　attributed　to　the　smaller　antiferromagnetic　moment　of　Co　than　that　of　Fe　on　4f1　sites,　as　well　as　the　reduction　in　the　antiferromagnetic　Fe　moments　at　4f1　and　4f2　sites.　The　total　density　of　states　indicates　a　transition　from　semiconductor　behavior　to　a　metallic　character　both　in　the　La-Co　and　La-Ca-Co　doped　versions.　The　experimental　results　validate　the　theoretical　predictions,　confirming　enhancements　in　magnetic　performance.　The　saturation　magnetization　increased　from　63.86　Am2/kg　in　SrFe　11.7　O　19　(SFO)　to　67.53　Am2/kg　in　Sr　0.4　La　0.4　Ca　0.2　Fe　10.5-　Co　0.5　O　19　composition.　These　findings　provide　a　vital　understanding　of　tuning　the　magnetic　and　electronic　properties　in　doped　SFO,　which　will　enable　the　development　of　advanced　applications　in　magnetic　materials.