In　this　study,　metal-organic　framework　(MOF)　layer　on　the　surface　of　tubular　ceramic　substrate　was　prepared　as　the　precursor　template　to　construct　ZIF-67-derived　CoSx　composite　membrane　through　in-situ　sulfurization　strategy.　During　the　sulfurization　process,　ZIF-67　as　a　template　was　reacted　with　sulfur　ions　to　form　CoSx.　Due　to　the　structure　change　of　the　ZIF-67　crystal,　the　aperture　of　the　CoSx　was　enlarged　with　the　thickness　of　the　separation　layer　decreased.　Moreover,　the　reorganization　of　the　separation　layer　caused　by　the　in-situ　sulfurization　eliminated　the　non-selective　defects.　Therefore,　a　CoSx　composite　membrane　can　be　obtained　with　high　separation　performance　and　good　stability　for　dye/salt　separation.　The　effects　of　sulfurization　and　operation　conditions　on　membrane　performance　were　studied.　The　CoSx　composite　membrane　had　outstanding　permeance　(751.6　LMH/MPa)　and　excellent　rejection　(＞　99.5%)　for　dye　molecules,　while　the　rejection　for　salt　was　below　18.7%.　The　separation　performance　of　the　CoSx　composite　membrane　can　be　maintained　over　100　h,　which　exhibited　great　potential　in　dye　desalination.