Pervaporation　has　been　considered　a　promising　technique　in　seawater　desalination.　Developing　new　and　efficient　pervaporation　membrane　material　remains　the　main　challenge.　In　this　study,　the　layered　double　hydroxides　(LDH)　nanosheet　array　composite　membranes　were　prepared　on　a　commercial　polyacrylonitrile　ultrafiltration　membrane　through　the　hydrothermal　method.　The　structure　and　morphology　of　the　LDH　array　was　regulated　by　the　hydrolysis　of　the　substrate　and　the　hydrothermal　conditions.　The　obtained　LDH　composite　membrane　had　a　good　pervaporation　desalination　performance　due　to　its　unique　water　molecular　transport　channel　and　high　hydrophilicity.　When　the　salt　concentration　in　the　feed　solution　increased　from　3　to　10　wt%,　the　rejection　of　the　composite　membrane　could　maintain　at　99.8　%.　The　real　seawater　was　also　used　to　evaluate　the　membrane.　The　results　indicated　the　LDH　composite　membrane　had　a　good　desalination　performance　in　a　relatively　wide　range.　Moreover,　the　LDH　composite　membrane　exhibited　excellent　flexibility　and　stability.　We　anticipated　that　the　membrane　may　have　great　potential　in　pervaporation　desalination.