Throughout　their　lifespan,　monopile　foundations　supporting　offshore　wind　turbines　inevitably　experience　horizontal　loads　from　waves,　winds,　and　currents,　resulting　in　cumulative　deformation.　It　has　been　believed　that　deformation　caused　by　horizontal　loading　weakens　the　interaction　between　the　pile　and　the　soil,　leading　to　a　reduction　in　the　ultimate　uplift　bearing　capacity　of　the　pile　foundation.　However,　there　is　a　scarcity　of　literature　investigating　this　issue,　particularly　regarding　monopiles　used　in　offshore　wind　turbine　installations.　Therefore,　this　study　aims　to　explore　the　impact　of　horizontal　cyclic　loads　on　the　ultimate　uplift　bearing　capacity　of　monopile,　focusing　on　the　pile–soil　interaction.　To　achieve　this,　a　series　of　1　g　model　tests　were　conducted　on　a　rigid　model　pile　embedded　in　silt　with　varying　relative　compaction.　The　test　results　indicate　that　the　ultimate　uplift　bearing　capacity　of　the　pile　is　significantly　diminished　after　experiencing　horizontal　cyclic　loading,　and　the　extent　of　reduction　is　closely　linked　to　the　amplitude　of　the　horizontal　deformation.　A　semi-empirical　model　is　developed　to　predict　the　ultimate　uplift　bearing　capacity　of　the　pile　foundation　following　horizontal　cyclic　loading.　The　key　findings　of　this　study　are　as　follows:　(1)　The　earth　pressure　in　the　active　zone　gradually　decreases　with　an　increasing　number　of　cycles,　while　the　earth　pressure　in　the　passive　zone　experiences　a　slight　increase　under　horizontal　cyclic　loading.　(2)　The　position　of　the　pile　rotation　center　under　horizontal　cyclic　loading　is　approximately　0.84　times　the　depth　at　which　the　pile　is　buried,　and　this　relationship　appears　to　be　independent　of　soil　density　and　cyclic　load　ratio.　(3)　The　variation　of　earth　pressure　corresponding　to　the　horizontal　deformation　of　the　pile　in　the　active　zone　can　be　divided　into　three　phases:　a　rapid　decline　phase,　a　slow　decline　phase,　and　a　stable　phase.　(4)　The　reduction　in　the　ultimate　uplift　capacity　is　influenced　by　the　cyclic　ratio　and　number　of　cycles　but　does　not　appear　to　have　a　significant　relationship　with　soil　density.　©　2023　by　the　authors.