Due to the characteristics of large bearing capacity, small sliding ratio, and error adaptability, curve-surface conjugate gear drives are utilized in the novel Solar Alpha Rotary Joint of China Space Station to ensure the posture of solar panels. However, conventional precision processing techniques face challenges in generating high-precision curve-surface gears due to the unique tooth surface geometry and non-envelope configuration principle. Fortunately, the advantages of free-form milling have made it possible to achieve precision manufacturing of curve-surface gears. Based on the geometric errors of machine tool and tool deformation, a novel deviation correction method is proposed for tooth surface reconstruction. Firstly, the design and construction methods for curve-surface conjugation are presented, along with the development of a mathematical model for curve-surface gear. The processing error model considering geometric errors of machine tool and tool deformation is established. Then, the mirror image method is introduced to derive the deviation correction model based on processing errors, and the simulated modification values are obtained. Finally, processing tests are conducted to verify the effectiveness of the proposed deviation correction method, resulting in an improvement in gear accuracy from quality class 8 to class 4. [ABSTRACT FROM AUTHOR]