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Light incident upon a leaf surface will be partially reflected, partially absorbed and partially transmitted. Green plant tissues show an auto fluorescence in the visible spectral range that is excited by UV or visible light. Key pigments in plants, including chlorophyll, carotenoid and other compounds, such as flavonol and anthocyanin, generally have the property of emitting fluorescence after excitation. Fluorescence imaging is a kind of advance techniques based on computer vision. The health information of plant can be acquired by analyzing its fluorescence image without influencing its growth condition. This paper reviewed the researches of applying fluorescence imaging technology to detect plant diseases and compared this technology with RGB imaging, hyperspectral imaging, multispectral imaging and thermal infrared imaging techniques.