A　model　of　a　submerged　angular　cavitation　nozzle　is　established,　which　consists　of　a　contraction　part,　parallel　middle　part,　and　expansion　part.　Based　on　the　CFD　technique,　a　numerical　simulation　of　the　flow　field　of　the　submerged　cavitation　nozzle　is　carried　out,　in　which　a　multiphase　mixture　model,　cavitation　model,　and　renormalization　group　(RNG)　k-epsilon　turbulence　model　are　applied.　Considering　the　influence　of　mixture　density　on　cavitation,　the　effects　of　the　inlet　contraction　part,　parallel　middle　part,　and　outlet　expansion　part　on　the　velocity　and　vapor　volume　fraction　are　studied.　The　numerical　simulation　results　show　that　the　mixture　density　is　essential　in　the　cavitation　jet.　When　the　nozzle　diameter　d　is　fixed,　the　designed　angular　cavitation　nozzle　with　contraction　angle　alpha　=　13.5　degrees,　parallel　middle　part　length　Ld　=　3d,　expansion　part　length　Le　=　4d,　and　expansion　angle　beta　=　60　degrees　can　effectively　bring　out　cavitation.　A　cavitation　cloud　is　produced　near　the　rigid　wall　of　the　outlet　expansion　section　and　diffuses　in　a　vortex　ring　shape.　Optimizing　the　nozzle　structure　can　improve　the　cavitation　effect　of　the　nozzle.　The　feasibility　of　this　model　is　verified　by　relevant　experimental　data.