To　improve　the　recycling　efficiency　of　magnetic　recycling　system,　magnetothermally　responsive　composite　submicron　particles　(CFMNs@PEG　CSPs)　were　designed　and　prepared　for　recyclable　catalytic　applications,　in　which　poly(ethylene　glycol)　gel　was　used　as　the　shell　and　clusters　of　cobalt　ferrite　magnetic　nanoparticles　as　the　core.　A　novel　strategy　for　recycling　both　loadings　and　carriers　was　proposed　based　on　loadings　immobilized　CFMNs@PEG　CSPs　via　magnetic　separation　at　first　and　then　magnetothermally　responsive　release.　The　morphology　and　core–shell　structure　were　observed　by　transmission　electron　microscope.　The　physicochemical　characteristics　were　investigated　by　Fourier　transform　infrared,　1H　NMR,　Magnetic　property　measurement　system,　thermogravimetric　analysis　and　X-ray　photoelectron　spectroscopy.　The　size　of　CFMNs@PEG　CSPs　was　285.1　±　7.6　nm　(the　core　was　160.0　±　13.2　nm　and　PEG　gel　shell　was　62.6　nm).　The　shell　thickness　of　CFMNs@PEG　CSPs　shrunk　from　62.6　nm　to　35.5　nm　when　the　temperature　changed　from　25　°C　to　50　°C,　and　more　than　95%　of　the　loadings　were　released　in　30　min　by　magnetothermally　responsive　release.　Combing　magnetic　separation　and　magnetothermally　responsive　release,　CFMNs@PEG　CSPs　were　recycled　over　42　times　for　horseradish　peroxidase　catalysis　(horseradish　peroxidase　was　re-immobilized　for　six　times　and　reused　seven　times　for　each　re-immobilization)　and　25　times　for　gold　nanoparticles　catalysis　(reactivated　gold　nanoparticles　were　re-immobilized　for　five　times　and　reused　five　times　for　each　re-immobilization)　without　significant　catalytic　activity　loss,　indicating　their　extensive　potential　in　recyclable　catalytic　applications　and　other　applications.　©　2020　Elsevier　B.V.