According to the requirements of PCF splice system that the microscope objectives must work long distance, high magnification and high resolution, special optical lens is designed to get PCF information of end face, which is optimized through the ZEMAX simulation. The optical lens has 40×high magnification, 5 mm long working distance, 1 μm high resolution, and 500 μm×500 μm field. Finally, it is proved that the lens meet all the requirements by the experiments.