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The gallium arsenide lens (GaAs lens) uses a single-point diamond ultra-precision multi-axis free-form surface processing machine tool, and is processed through ultra-high-precision single-point turning, grinding, measuring, ultra-high-precision polishing and other processes. Under precise control of the machine tool and processing environment, To achieve ultra-high precision processing in the plastic domain of optical aspheric surfaces, ultra-high precision correction polishing technology is used to polish the lens surface to achieve an infrared aspheric lens with an optical aspheric surface shape accuracy ≤ 0.1 micron and a surface roughness Ra ≤ 0.01 micron.