A space-based target imaging simulation system based on visible imaging is designed and implemented for space point target. The space-based target detection imaging process is analyzed. The imaging simulation process is divided into four parts: orbit simulation, star background imaging simulation, target imaging simulation and charge coupled device (CCD) sensor simulation. In the part of target imaging simulation, satellite structures are simplified as rectangles, cylinders and spheres. The concept of target optical cross section is proposed reference for radar cross section. The brightness of target on imaging plane is calculated easily and quickly using the target optical cross section. The proposed system based on visible imaging achieves space-based space point target imaging simulation over a long distance. The observation simulation image of space target is obtained by the proposed system at any time, on any orbit with different major structures.