To address the bottlenecks of high cost and long development cycles in traditional aerospace product manufacturing, and to meet the urgent demand for batch production of space optical payloads in giant satellite constellations, this study adopts an integrated approach combining modular structural design, process optimization, and automated testing technology to develop a Maksutov-Cassegrain optical system with a small F-number and minute pixels. By enab-ling interchangeable assembly of lenses and focal plane components, along with integration into an automated assembly and testing line, the system achieves a ground pixel resolution of 4.5 m and a swath width of 13.5 km × 13.5 km at an orbital altitude of 500 km, with a total weight of only 1.1 kg. This approach has improved the overall development efficiency by 50%. The results provide crucial technical support for the low-cost, rapid, and batch-producible manufacturing of miniaturized space optical payloads.