Abstract: To ensure safe operation of nuclear facilities, monitoring areas exposed to nuclear radiation is essential. This study presents a 5^× continuous-zoom radiation-proof lens. Unlike conventional fixed-focus lenses, the proposed system enables simultaneous observation of targets at varying distances, providing both short-focal-length monitoring and long-focal-length positioning analysis. The optimal design employs a mechanically compensated structure with positive group compensation. Lens elements are fabricated from radiation-resistant glass with separation components, whereas the structural housing is composed of tungsten to provide superior radiation protection shielding. To achieve high image quality, reasonable structure, and reliable manufacturability, the continuous-zoom radiation-proof lens was developed through calculation of initial structural parameters, aberration correction, and evaluation of final image performance. The proposed lens not only demonstrates radiation resistance but also provides enhanced anti-radiation functionality. Compared with similar foreign products, it exhibits superior radiation shielding while incorporating a continuous-zoom system, thereby addressing a critical gap in domestic technologies. This development offers significant engineering reference value for radiation-resistant camera systems and contributes to cost reduction and enhanced localization.