In　recent　years,　as　a　key　enabler　of　intelligent　transportation　systems,　the　Internet　of　vehicles　has　brought　immersive　user　experiences.　However,　there　are　still　some　problems　in　the　Internet　of　vehicles　system,　such　as　poor　connectivity　of　vehicle　network　and　low　efficiency　of　data　calculation　and　processing.　Due　to　its　flexibility,　low　cost　and　easy　deployment,　unmanned　aerial　vehicle　(UAV)　has　attracted　extensive　attention　and　in-depth　research　in　industry　and　academia.　The　application　of　UAV　technology　in　the　field　of　Internet　of　vehicles　can　improve　the　data　transmission　performance　significantly　and　promote　the　development　of　Internet　of　vehicles　efficiently.　This　paper　reviews　the　research　status　and　key　technologies　of　UAV-assisted　Internet　of　vehicles　systematically.　Firstly,　the　research　background　related　to　the　Internet　of　vehicles　and　UAV　is　briefly　introduced.　Secondly,　the　research　progress　of　UAV-assisted　vehicle　network　is　introduced　in　detail　from　the　aspects　of　routing　protocol,　trajectory　optimization,　content　cache,　computing　unload　and　security　and　privacy.　Finally,　the　challenges　and　future　trends　in　this　field　are　discussed.　©　2022　Inst.　of　Scientific　and　Technical　Information　of　China.　All　rights　reserved.