Pervaporation　is　a　promising　desalination　technology.　Developing　high-performance　and　stable　pervaporation　membranes　with　high　continuity　structure　remains　a　significant　challenge.　This　study　reports　the　development　of　a　novel　layered　double　hydroxide　(LDH)　nanosheet　composite　membrane　fabricated　using　a　hydroxyl　salt　induction　method.　This　approach　facilitated　the　in-situ　nucleation　and　growth　of　the　CoAl-LDH　nanosheets　on　polyvinylidene　fluoride　(PVDF)　substrate,　reducing　precursor　concentration　and　enhancing　preparation　efficiency.　The　resulting　cross-compatible　architecture　closely　integrated　the　dense　LDH　nanosheet　separation　layer　with　the　flexible　PVDF　support.　The　microstructure　and　morphology　of　the　hydroxyl　salt　layer　and　its　transformed　CoAl-LDH　composite　membrane　were　comprehensively　investigated.　The　optimized　membrane　was　applied　for　pervaporation　desalination　(3　wt%　NaCl,　50　degrees　C),　achieving　a　high　flux　of　38.4　kgm(-2)h(-1)　and　exceptional　NaCl　rejection　of　99.9　%.　It　also　demonstrated　excellent　tolerance　to　a　wide　salinity　range,　maintaining　99.6-99.9　%　rejection　even　at　20　wt%　NaCl,　while　the　flux　remained　stable　at　26.7　kgm(-2)h(-1).　Long-term　testing　confirmed　the　consistent　separation　performance　and　operational　stability,　underscoring　the　great　potential　of　this　advanced　membrane　material　for　practical　pervaporation　desalination　applications.