A　nano-filtration　membrane　with　a　loose　LDHs/polymer　hybrid　layer　which　aimed　at　the　desalination　of　textile　wastewater　was　fabricated　by　chelating-assisted　in-situ　growth　of　layered　double　hydroxides　(LDHs)　on　the　organic　substrate.　The　positively　charged　polyethyleneimine　(PEI)　with　excellent　chelating　ability　to　metal　ions　was　initially　deposited　on　the　hydrolyzed　polyacrylonitrile　(PAN)　membrane　surface　by　electrostatic　interaction.　Then,　Co2+　ions　were　immobilized　on　the　modified　membrane　though　chelating　reaction　to　form　a　Co2+/PEI　complex　layer,　which　provided　a　Co2+　source　for　the　in-situ　growth　of　Co/Ni　LDHs　at　a　lower　temperature.　Besides,　the　LDHs/PEI　hybrid　membrane　prepared　at　optimized　condition　achieved　a　sufficient　permeability　(198.6　L/(m(2).h.MPa)),　high　rejection　for　dyes　(methyl　blue　97.9%　and　acid　fuchsin　97.5%)　and　low　salt　rejection　(less　than　3%).　Meanwhile,　this　membrane　possessed　good　hydrophilicity,　satisfactory　antifouling　performance　(flux　recovery　ratio　was　89.5%　for　humic　acid　(HA))　and　remarkable　long-term　stability.　The　loose　LDHs/　polymer　hybrid　layer　was　conducive　to　the　transport　of　ions　and　water　molecules,　since　the　ridge-and-valley　surface　structure　enhanced　the　steric　hindrance　effect　and　consequently　increased　the　rejection　of　macromolecules.　Therefore,　this　surface　modification　strategy　can　be　applied　to　construct　a　ridge-and-valley　porous　structure　on　substrate　for　desalination　of　textile　wastewater.