Supercritical　water　gasification　(SCWG)　is　a　promising　technology　for　oil-containing　wastewater　treatment.　This　paper　aims　to　establish　a　reaction　kinetic　model　to　provide　better　guidance　for　optimal　industrial　reactor　design.　The　model　is　developed　based　on　the　experimental　results　obtained　from　K2CO3-catalyzed　SCWG　of　diesel　(the　model　compound　of　oil　containment　in　wastewater)　at　various　conditions　of　500–650　°C　and　15.23–64.45　s.　Then　the　model　validation　by　using　the　experimental　data　from　other　conditions.　The　validation　results　showed　that　the　kinetic　model　can　predict　the　gas　concentration　with　an　acceptable　deviation.　Afterward,　the　indicators　of　carbon　gasification　efficiency　and　gas　yield　versus　residence　time　are　predicted.　The　results　show　that　the　required　residence　time　for　the　complete　gasification　is　varied　from　214.2　to　2150.8　s　when　the　temperature　changes　from　500　to　650　°C.　Moreover,　the　reaction　rate　analysis　result　indicates　that　the　two　reactions　contributed　most　to　the　hydrogen　production　are　the　forward　water-gas　shift　and　the　reverse　CO　methanation　reaction.　Additionally,　the　sensitivity　analysis　result　reveals　that　the　hydrolysis　reaction　of　diesel　has　a　significant　influence　at　the　initial　stage,　while　the　CO　and　CO2　methane　reactions　play　a　vital　role　at　the　late　stage　for　gas　production.　©　2022　Hydrogen　Energy　Publications　LLC