A kind of novel fabrication system of array optical fiber gratings is proposed and multi-wavelength array optical fiber gratings are obtained on 8-core ribbon optical fiber through this structure with only one phase mask. By means of image processing, the dynamic images are collected during the array gratings fabrication and the relative pixel shifts are monitored, and then fiber slip regulation are analyzed and obtained. In order to resist the influence of fiber slip, the specially-designed fixture is designed, and the material and shape of the clamping surface are improved many times. The experiment results show that the macrobending surface of the clamping surface can not only fix the ribbon optical fiber, but also keep the coating in good condition. We successfully obtained array optical fiber Bragg gratings with 0.2 nm bandwidth, wavelength interval less than 0.5 nm, wavelength deviation less than 0.05 nm and reflectivity more than 80% on ribbon optical fiber by the above system.