In　this　study,　the　SnO2　nanoflowers　with　hierarchical　structures　sensitized　by　boron　nitride　quantum　dots　(BNQDs)　were　prepared　through　a　simple　hydrothermal　method.　It　was　applied　for　the　detection　of　the　BTEX　vapors.　Further　investigation　showed　that　the　response　value　of　SnO2　sensitized　by　different　amounts　of　BNQDs　to　the　BTEX　gases　have　a　certain　improvement.　Especially　10-BNQDs/SnO2　gas　sensor　exhibited　a　significant　improvement　in　gas　sensing　performance　and　its　response　values　to　different　BTEX　gases　was　increased　up　to　2-4　folds　compared　with　the　intrinsic　SnO2　sensor.　In　addition,　SnO2　nanoflowers　based　gas　sensor　showed　surprisingly　fast　response　and　recovery　time　for　BTEX　gases　with　1-2　s.　That　can　be　attributed　to　the　sensitization　of　BNQDs　and　the　hierarchical　structure　of　SnO2　nanoflowers,　which　provided　an　easy　channel　for　the　gas　diffusion.　An　economically　viable　gas　sensor　based　on　BNQDs　sensitized　SnO2　nanoflowers　exhibited　a　great　potential　in　BTEX　gas　detection　due　to　the　simple　synthesis　method,　environmentally　friendly　raw　materials　and　excellent　gas　sensing　performance.