This　paper　presents　basic　structure　and　working　principle　of　a　novel　recycling　supersonic　separator.　At　present,　an　experimental　rig　of　the　recycling　supersonic　separator　was　constructed　and　systematic　experimental　investigations　were　carried　out.　The　experimental　results　showed　that　comparing　with　the　already-existing　supersonic　separators,　recycling　supersonic　separator　could　attain　higher　dew　point　depression　with　the　same　pressure　loss　ratio,　which　indicates　that　this　novel　device　has　better　dehydration　and　separation　performances.　In　order　to　study　and　predict　the　flow　behavior　and　the　shock　wave　location　inside　the　recycling　supersonic　separator,　a　two-dimensional　physical　mathematical　model　was　established　and　used　to　carry　out　the　numerical　simulation　of　steady　flow　inside　the　recycling　supersonic　separator.　Simulation　results　show　that　the　shock　wave　can　be　shifted　to　the　inlet　of　diffuser,　and　the　flow　pressure　loss　can　be　reduced.　So　the　configuration　of　this　device　can　improve　the　dehydration　performance　and　efficiency.