In order to solve the problem of primary imaging of visible light and infrared light, a wide-spectral aberration-corrected telescope system based on wedge-shaped beam splitter for simultaneous imaging of visible-infrared light was developed. The device uses a Cassegrain main system with a common aperture channel, and the beam splitter adopts a wedge plate design. By optimizing the design of the wedge angle of the beam splitter, the generation of reflected visible light ghost images can be suppressed, and the transmission is corrected to a certain extent. The aberration of infrared band imaging improves the resolution of the system. According to the design index, the Zemax software was used to simulate, and the results showed that the three imaging channels of the infrared light path, the visible light path and the infrared spectrum switching light path were better than λ/10 for the RMS wave aberration. In addition, the whole device system was analyzed and discussed separately, and the influence of manufacturing errors caused by the wedge beam splitter and system installation errors on the imaging quality was discussed, which served as a reference for the subsequent processing and installation of the device. Finally, the as-built telescope system was tested and analyzed with interferometer. The test results showed that the RMS of the main system was 0.093λ, the RMS of the visible light path was 0.120λ, and the imaging quality met the design requirements. The system adopts a Cassegrain common optical path, and uses a wedge-shaped plate to achieve synchronous imaging of visible light to mid-infrared light, which reduces the volume of the system and expands the function of the device.