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Driven by the requirement to ultraviolet detection, β -Ga _2 O _3 UV photodetectors have attracted great attention. Using a metal organic chemical vapor deposition (MOCVD) reactor, we grew β -Ga _2 O _3 nanowires array on a GaN substrate using Ga as catalyst. The density of the nanowires was optimized employing the substrate patterning technology. A UV detector based on the graphene/ β -Ga _2 O _3 -nanowire-array was realized by micro-fabrication techniques. The device has a wide range of UV response covering UVC-UVA band and the peak response reaches 30.82 mA W ^−1 at 258 nm corresponding to the band gap of β -Ga _2 O _3 . The rapid response speed (<1 s) is comparable to that of most reported Ga _2 O _3 nanowire ultraviolet photodetectors.