A highly integrated optical imaging system with a wide field of view (FOV) and high resolution was proposed to meet the performance requirements of modern photoelectric imaging systems. The system consisted of a concentric spherical lens and an array of micro-cameras arranged in the Galilean concentric multiscale structure. A wide FOV was achieved owing to the structure of the spherical lens. The multiscale micro-camera array enabled capturing of images at high resolution and with a wide field of view. Further, the Galilean structure made the system more compact. In addition, the arrangement of the camera array was designed to reduce the number of cameras and realize a lightweight system. By optimizing the design of the whole system, the modulation transfer function (MTF) can reach 0.3 at a frequency of 270 lp/mm.The root mean square (RMS) radius of the full field of view of the system is also smaller than the detector pixel size of 1.85 μm, indicating an excellent imaging effect from the system. Moreover, results of the tolerance analysis indicate that the system is easy to manufacture. Thus, the system not only realizes a wide field of view and high- resolution imaging, but also has low structure complexity and a compact volume structure.