Incorporating　hydrophilic　nanomaterial　fillers　into　a　polymeric　matrix　enables　a　high-performance　ultrafiltration　membrane.　2D　Ti3C2TX　nanosheets　are　promising　candidates　due　to　their　hydrophilic　nature　and　good　dispersion　ability　in　the　organic　solvent.　In　this　study,　novel　polysulfate　(PSE)/Ti3C2TX　ultrafiltration　membranes　were　prepared　by　non-solvent　induced　phase　separation　(NIPS)　method.　The　phase　inversion　process　of　the　PSE/Ti3C2TX　casting　membranes　was　visualized.　Ti3C2TX　nanosheets　could　tune　the　phase　inversion　process　effectively　and　promote　the　phase　inversion　speed　with　an　ultralow　content　of　0.05　wt%.　As　a　result,　the　hydrophilic　property　and　porosity　of　PSE/Ti3C2TX　membrane　could　be　improved.　The　skin　layer　thickness　was　significantly　reduced,　resulting　in　saliently　ultrafiltration　performance,　i.e.,　a　pure　water　flux　(PWF)　of　685　L*m(-2)*h(-1)　(LMH)　with　a　bovine　serum　albumin　(BSA)　rejection　of　97%.　The　proposed　ultralow　Ti3C2TX　doping　in　the　casting　solutions　method　offers　a　versatile　platform　to　manipulate　the　phase　inversion　progress　during　the　industrially　NIPS　process,　and　enhanced　the　separation　performance　of　ultrafiltration　membranes.