Corrosion　fatigue　damage　occurs　when　metallic　materials　are　subjected　to　cyclic　loading　in　a　corrosive　medium.　In　this　study,　a　phase　field　framework　is　proposed　to　predict　the　corrosion　fatigue　of　carbon　steels.　The　coupling　effect　of　fatigue　and　corrosion　is　explicitly　implemented　in　the　proposed　phase　field　framework　by　coupling　the　displacement　field,　electrochemical　field　and　phase　field.　A　degradation　function　of　the　interface　free　energy　density　with　the　consideration　of　elastic　and　plastic　strain　energies　is　introduced　to　account　for　the　fatigue　damage　accumulated　during　the　corrosion　fatigue　process.　The　applicability　of　this　framework　is　validated　by　accurately　capturing　the　pure　fatigue　and　corrosion　fatigue　behaviors　of　compact　tension　specimens,　particularly　the　acceleration　effect　of　corrosion　on　the　fatigue　crack　growth.　The　propagation　morphology　and　rate　of　the　corrosion　fatigue　crack　in　single　pit　and　multiple　pit　models　are　studied.　The　distribution　of　stress　state　and　strain　energy　density　induces　the　directionality　of　crack　propagation.　The　influence　of　loading　frequency　on　the　corrosion　fatigue　process　is　discussed　in　detail.　Due　to　the　corrosion-fatigue　coupling　effect,　the　corrosion　rate　increases　with　increasing　of　the　loading　frequency,　resulting　in　an　accelerated　corrosion　fatigue　process.　Moreover,　the　significance　of　the　plasticity　in　the　prediction　of　corrosion　fatigue　is　emphasized.