In　this　paper,　a　novel　composite　coating　combining　Layered　Double　Hydroxides　(LDH)　film　and　Micro-arc　Oxidation　(MAO)　ceramic　layer　was　designed　to　further　enhance　anti-corrosion　protection　of　coating.　The　MgFe-LDH/MAO　composite　coating　was　prepared　through　in　situ　synthesis　MgFe-LDH　nanoflakes　on　the　surface　of　MAO　coating.　Subsequently,　the　active　anti-corrosion　mechanism　of　MgFe-LDH　layer　was　revealed　through　microstructure　characterization　and　electrochemical　test.　Furthermore,　the　interaction　between　LDH　nanoflakes　and　original　MAO　coating　was　investigated,　too.　The　results　show　that:　LDH　nanoflakes　preferentially　grow　in　the　pores　of　original　MAO　coating,　and　form　a　dense　layer　on　MAO　coating.　In　situ　prepared　LDH　layer　gives　a　strong　and　stable　adhesion　on　MAO　coating,　besides　the　dissolution　of　original　MAO　coating　affects　LDH　growth.　MgFe-LDH　layer　supplied　an　active　anti-corrosion　protection　for　Mg　alloy,　since　LDH　can　effectively　seal　the　inherent　defects　of　MAO　coating　and　absorb　corrosive　medium　in　environment.　©　2020