In recent years, the nanostructures of semiconductor materials has attracted wide attention because of its unique and novel size-related characteristics, especially nano-metal oxides. Gallium oxide nanomaterials have excellent photoelectric properties, gas sensing properties, pressure resistance and low loss properties, which bring new opportunities to many research fields such as materials science, electronics and chemistry. In this paper，the preparation methods of nano gallium oxide are reviewed, and its application in photoelectric detection is prospected.