Nanocomposites　have　significant　potential　in　the　development　of　advanced　materials　for　numerous　applications.　Tin　dioxide　(SnO2)　is　a　functional　material　with　wide-ranging　prospects　because　of　its　high　electronic　mobility　and　wide　band　gap.　Graphene　as　the　basic　plane　of　graphite　is　a　single　atomic　layer　two-dimensional　sp(2)　hybridized　carbon　material.　Both　have　excellent　physical　and　chemical　properties.　Here,　SnO2　quantum　dots/graphene　composites　have　been　successfully　fabricated　by　a　facile　ultrasonic　method.　The　experimental　investigations　indicated　that　the　graphene　was　exfoliated　and　decorated　with　SnO2　quantum　dots,　which　was　dispersed　uniformly　on　both　sides　of　the　graphene.　The　size　distribution　of　SnO2　quantum　dots　was　estimated　to　be　ranging　from　4　to　6　nm　and　their　average　size　was　calculated　to　be　about　4.8　+/-　0.2　nm.　This　facile　ultrasonic　route　demonstrated　that　the　loading　of　SnO2　quantum　dots　was　an　effective　way　to　prevent　graphene　nanosheets　from　being　restacked　during　the　reduction.　During　the　calcination　process,　the　graphene　nanosheets　distributed　between　SnO2　nanoparticles　have　also　prevented　the　agglomeration　of　SnO2　nanoparticles,　which　were　beneficial　to　the　formation　of　SnO2　quantum　dots.