The　properties　of　polymer　blends　strongly　depend　on　their　microstructure.　Thus,　tuning　the　phase　structure　and　improving　the　interfacial　interaction　of　blends　are　relatively　crucial.　Inspired　by　the　breaking　and　reformation　of　dynamic　covalent　bonds　in　vitrimers,　these　special　bonds　are　introduced　into　the　phase　interface　of　polymer　blends　in　this　work.　Through　reactive　blending　of　epoxidized　natural　rubber　(ENR),　polylactic　acid　(PLA)　and　additives,　polymer　blends　with　dynamic　interfacial　cross-linking　are　fabricated.　The　prepared　blends　with　intensive　interfacial　interactions　display　excellent　recycling　capacity.　Strikingly,　after　etching　the　dissolvable　substances　with　a　solvent,　the　porous　phase　structure　of　original　polymer　blends　changes　to　a　fiber-like　phase　structure　of　the　third　recycled　blends,　entirely　distinct　from　most　reported　phase　structures　in　polymer　blends.　In　addition,　the　composites　show　great　enhancements　in　mechanical　properties　during　recycling.　This　work　provides　an　effective　method　to　tune　the　phase　structure　and　improve　the　interfacial　interaction　of　polymer　blends.