Metal　rubber　(MR)　with　excellent　mechanical　properties　and　porosity　is　often　used　as　a　filter　material　in　mechanical　systems.　Oil　filtration　involves　not　only　the　recycling　of　contaminated　oil,　but　more　importantly,　it　ensures　normal　functioning　of　the　hydraulic　system　and　lubrication　system.　Here,　one-step　etching　method　was　employed　to　fabricate　the　superhydrophilic　and　underwater　superoleophobic　MR.　The　modified　MR　could　efficiently　and　quickly　separate　oil-water　mixtures,　especially　oil-water　mixtures　of　several　oils　(gasoline,　diesel,　engine　oil,　kerosene)　commonly　used　in　machinery,　driven　by　gravity.　Furthermore,　the　modified　MR　demonstrate　the　excellent　durability　and　maintain　the　high　efficiency　after　multiple　oil-water　separations.　Significantly,　the　modified　MR　also　showed　good　thermal　resistance　and　corrosion　resistance.　This　research　has　provided　MR　with　a　new　functionality.　This　opens　a　new　avenue　for　MR　to　be　used　for　separation　of　oil-water　mixture,　thereby　expanding　greatly　its　application　in　filtration.　©　2019　Elsevier　B.V.