The　hydrophobic　magnetic　materials　of　HMC-1　and　HMC-2　were　obtained　by　blending　synthesized　Fe3O4　nanoparticles　and　commercial　CaCO3　powder　with　stearic　acid　solution,　which　is　used　as　hydrophobic　modifier.　HMC-2　was　loaded　on　the　PU　sponge　for　the　further　improvement　of　the　applicability.　The　structural　properties　of　the　two　materials　were　detected　by　X-ray　powder　diffractometer　and　infrared　spectrometer.　Thermal　stability　of　HMC-2　was　analysed　by　differential　scanning　calorimeter.　The　hydrophobic　properties　of　the　samples　were　determined　by　contact　angle　meter.　The　results　show　that　HMC-2　has　more　stable　hydrophobic　properties　than　HMC-1.　HMC-2　exhibits　more　stable　hydrophobic　performance.　The　contact　angle　remains　nearly　unchanged　(about　150°)　after　oil　removal.　HMC-2　shows　no　release　of　Fe()　ions,　which　has　taken　place　during　the　oil　removal　experiment　using　HMC-1.　PU　sponge　loaded　with　HMC-2　can　remove　98%　oil　in　3　s.　The　oil　removal　rate　remains　95%,　after　20　times　of　repeated　oil　absorption.　The　mass　ratio　of　oil　adsorption/adsorbent　is　larger　than　100.　©　2022,　Journal　of　Materials　Engineering.　All　right　reserved.