We　proposed　a　simple　and　easy　approach　for　the　one-step　synthesis　of　magnetic　calcium　alginate　hydrogel　microparticles　using　one　surface　acoustic　waves　droplets　microfluidics　device.　By　adjusting　the　input　parameters　of　the　interdigital　transducer,　the　magnetic　droplets　with　different　size　can　be　generated　on　demand.　Then　the　prepared　magnetic　droplets　were　cross-linked　after　crossing　the　oil/water　interface　induced　by　gravity　force,　and　the　calcium　alginate　magnetic　microparticles　with　tadpoles　shape　were　generated　effectively.　The　magnetic　hydrogel　microparticles　may　have　important　application　potential　in　cell　manipulation　and　medical　diagnosis　due　to　its　good　controllability.　©　2021　IEEE.