Combining　multiple　advanced　oxidation　processes　(AOPs)　is　essential　for　the　efficient　treatment　of　dye　wastewater.　In　this　study,　the　degradation　efficiencies　of　various　oxidation　methods,　including　hydrodynamic　cavitation　(HC),　dielectric　barrier　discharge　(DBD)　plasma　oxidation,　ultraviolet　C　(UVC),　and　their　combination　HC　+　DBD　+　UVC,　were　investigated　for　Methyl　Orange　(MO).　The　photolysis　of　ozone　(O-3)　and　the　degradation　mechanism　associated　with　HC　+　DBD　+　UVC　were　analyzed　to　elucidate　the　pathway　of　MO　degradation.　The　results　demonstrated　that　the　combination　of　HC　+　DBD　+　UVC　exhibited　a　significantly　enhanced　degradation　efficiency　compared　to　other　process　combinations,　achieving　a　removal　efficiency　exceeding　91%　within　a　5-min　timeframe.　Optimal　parameters　for　achieving　a　99.5%　degradation　rate　of　10　mg/L　MO　were　determined　as　follows:　pH　4,　inlet　pressure　of　1.5　MPa,　utilization　of　eight　UV　lamps　with　a　power　input　of　46.11　W.　During　the　degradation　process,　hydroxyl　radicals　(OH)　and　ozone　(O-3)　played　crucial　roles,　while　the　incorporation　of　UV　lamps　effectively　mitigated　ozone　(O-3)　emissions　and　enhanced　the　oxidation　of　ozone　(O-3).　In　conjunction　with　the　analysis　of　degradation　products　using　liquid　chromatography-mass　spectrometry,　it　is　highly　probable　that　the　MO　degradation　pathway　involves　reductive　cleavage　of　the　azo　bond　through　OH　attack.　Compared　to　other　experimental　methods　in　literature,　HC　+　DBD　+　UVC　exhibits　significant　advantages　such　as　enhanced　efficiency　and　absence　of　additives.　This　innovative　approach　offers　a　rapid　and　practical　on-site　solution　for　efficient　MO　dye　wastewater　treatment.