The　aging　of　SBS　modified　bitumen　(SMB)　involves　bitumen　aging　and　SBS　degradation.　Traditional　rejuvenators　restore　bitumen　properties　by　rebalancing　its　chemical　composition　but　fail　to　repair　damaged　SBS.　Some　reactive　rejuvenators　can　repair　damaged　SBS,　improving　low　temperature　performance　of　rejuvenated　SMB　but　compromising　high　temperature　stability.　In　order　to　achieve　rejuvenated　SMB　with　excellent　high　and　low　temperature　performance,　an　aliphatic　epoxy　compound　(1,6-hexanediol　diglycidyl　ether,　HDE),　aromatic　epoxy　compounds　(resorcinol　diglycidyl　ether,　RDGE;　2,2-bis　(4-glycidyloxyphenyl)　propane,　DGEBA;　N,　N,　N’,　N’-tetraglycidyl-4,4′-diaminodiphenylmethane,　MBDA),　a　catalyst　(Pentaethylenehexamine,　PEHA)　as　well　as　bio-oil　were　utilized　to　develop　a　novel　composite　reactive　rejuvenation　system.　The　optimal　composition　of　rejuvenation　system　was　determined　through　physical　properties　test,　followed　by　rheological　test　to　evaluate　rheological　properties　of　rejuvenated　SMB.　The　rejuvenation　effect　of　the　composite　system　was　demonstrated　using　FTIR　and　FM　tests,　and　the　molecular　dynamics　simulation　was　conducted　to　explore　the　composite　reaction　rejuvenation　mechanism　of　aged　SMB.　Results　show　that　the　combination　of　HDE　and　DGEBA　presents　superior　effectiveness　compared　to　others.　SBS　repaired　with　HDE　exhibits　enhanced　flexibility,　allowing　for　greater　molecular　chain　rearrangement,　which　leads　to　a　looser　molecular　structure　and　increased　free　volume　fraction,　enabling　rejuvenated　SMB　to　maintain　better　deformability　at　low　temperatures.　The　incorporation　of　DGEBA　introduces　rigid　groups　that　constrain　molecular　chain　conformation　and　slippage,　rotation,　or　stretching　between　chain　segments,　which　reduces　the　free　volume　fraction　and　improves　deformation　resistance.　Besides,　SBS　repaired　with　DGEBA　shows　stronger　interactions　with　asphaltenes,　better　restricting　their　mobility　and　enhancing　the　rigidity　of　bitumen.　At　an　HDE:DGEBA　ratio　of　1:1,　with　a　total　dosage　of　5　wt　%　by　weight　of　bitumen,　the　composite　reactive　rejuvenation　system　restores　crosslinking　network　of　SBS　in　bitumen　and　achieves　rejuvenated　SMB　with　excellent　high　and　low　temperature　performance.　©　2025　Elsevier　Ltd