This　study　focuses　on　the　design　and　fabrication　of　a　superhydrophilic　pyramid-shaped　porous　material　using　high-precision　3D　printing　technology　for　effective　oil-in-water　emulsion　separation.　The　unique　pyramid-shaped　structure　enhances　droplet　interception,　significantly　improving　separation　efficiency.　The　material＇s　surface　was　modified　with　a　self-polymerized　dopamine　(DA)　and　polyethyleneimine　(PEI)　coating,　resulting　in　superhydrophilic　and　underwater　superoleophobicity.　This　porous　material　achieved　a　separation　flux　of　3098　L/m2h　with　a　separation　purity　of　99.3　%.　Computational　Fluid　Dynamics　(CFD)　simulations　were　employed　to　visualize　the　emulsion　separation　mechanism,　providing　insights　into　the　dynamic　process　of　droplet　behavior　within　the　funnel　structure.　The　material　also　demonstrated　excellent　corrosion　resistance,　maintaining　its　performance　after　prolonged　exposure　to　acidic,　alkaline,　and　saline　environments.　These　results　suggest　that　the　developed　material　offers　a　promising　solution　for　high-efficiency　oil–water　separation　with　potential　applications　in　environmental　remediation　and　industrial　wastewater　treatment.　©　2024