Disclosed is an adjustable fixing device of a CCD plate comprising at least a central supporter and a mask device. The central supporter is made of non-transparency material. The mask device and the central supporter are approximately combined by a supporting device. The mask device and the central supporter are moved with respect to one another in a traveling range. An adhesive agent is filled to the place between the mask device and the central supporter for combining the mask device and the central supporter in a fixing position in the traveling range. Thereby, the central supporter is made of non-transparency material without needing to be performed with light shield process or installed with light shield element for effectively reducing cost. A preferred guiding structure is formed between the central supporter and the mask device for guiding the central supporter and the mask device so that they may move steadily. A larger adhesive area is formed between the central supporter and the mask device so that the central supporter and the mask device are more steadily combined.