A palladium‐catalyzed intermolecular annulation and arylation cascade between internal alkynes and o‐triazole bromobenzenes was developed, delivering to various polysubstituted [1,2,3]triazolo[1,5‐a]quinolines. Broad substrate scope, great functional group tolerance and simple operation of this transformation, hold great synthetic potential for the rapid construction of fused N‐heterocycles with biologically activity.