To　evaluate　the　investment　decisions　of　new　energy　vehicle　enterprises　scientifically　and　reasonably　and　improve　the　investment　efficiency　and　accuracy　of　decision-makers,　this　paper　proposes　an　investment　decision　method　based　on　interval　intuitionistic　fuzzy　sets.　In　the　investment　decision-making　process　of　new　energy　vehicle　enterprises,　first,　based　on　the　characteristics　of　new　energy　vehicle　enterprise　investment　projects,　an　index　system　is　constructed　to　comprehensively　cover　the　influencing　factors　of　investment　decisions.　Second,　we　obtain　the　interval　fuzzy　number　of　the　decision　index　through　a　questionnaire　survey,　use　the　structural　entropy　method　to　empower　decision　indicators,　and　comprehensively　evaluate　the　decision　index　by　the　organic　combination　of　the　interval-valued　intuitionistic　fuzzy　weighted　averaging　(IIFWA)　operator　and　structural　entropy　method.　Finally,　interval　BPA　is　used　to　express　the　value　of　each　decision　index　interval　intuitionistic　fuzzy　number.　Based　on　the　conversion　relationship　between　interval　evidence　and　the　intuitionistic　fuzzy　set,　the　orthogonal　sum　operation　results　of　the　intuitionistic　fuzzy　set　converted　from　the　normalized　interval　BPA　is　replaced　by　the　interval　evidence　combination　result,　and　the　final　decision　is　determined　by　comparing　the　fusion　result.　Applying　the　investment　decision　method　based　on　interval　intuitionistic　fuzzy　sets　to　the　field　of　new　energy　vehicle　investment　decision-making　can　provide　a　reference　for　investment　decision-makers　to　make　efficient　and　accurate　decisions,　and　it　has　application　value　and　practical　significance　to　promote　the　effective　development　of　new　energy　investment　decisions.