Superhydrophobic,　flexible,　and　ultrahigh-performance　electromagnetic　interference　(EMI)　shielding　papers　are　of　paramount　importance　to　safety　and　long-term　service　under　external　mechanical　deformations　or　other　harsh　service　environments　because　they　fulfill　the　growing　demand　for　multipurpose　materials.　Herein,　we　fabricated　multifunctional　papers　by　incorporating　sputter-deposited　nickel　nanoparticles　(NiNPs)　and　a　fluorine-containing　coating　onto　cellulose　filter　papers　coated　with　silver　nanowires　(AgNWs).　AgNW　networks　with　sputter-deposited　NiNPs　provide　outstanding　magnetic　properties,　electrical　conductivity,　and　EMI　shielding　performance.　At　an　AgNW　content　of　0.109　vol　%　and　a　NiNP　content　of　0.013　mg/cm2,　the　resultant　papers　exhibit　a　superior　EMI　shielding　effectiveness　(SE)　of　88.4　dB.　Additionally,　the　fluorine-containing　coating　endows　the　resultant　papers　with　a　high　contact　angle　of　149.7°.　Remarkably,　the　obtained　papers　still　maintain　a　high　EMI　SE　even　after　1500　bending　cycles　or　immersion　in　water,　salt,　or　strong　alkaline　solutions　for　2　h,　indicating　their　outstanding　mechanical　robustness　and　chemical　durability.　This　work　opens　a　new　window　for　designing　and　implementing　ultrahigh-performance　EMI　shielding　materials.　©　2021　American　Chemical　Society.