Abstract: Aiming at the noise problem caused by meshing impact in the gearbox of smart curtain actuators, this study employed precision manufacturing technology based on tooth profile modification to systematically validate its feasibility in reducing gearbox vibration noise and improving acoustic comfort. Through order analysis, the primary noise source was identified. On this basis, the tooth profile was modified according to the elastic deformation of the gear pair under the rated load, thereby optimizing its load distribution. A KISSsoft simulation model was established to systematically evaluate the effects of different modification amounts on key performance indicators, including transmission error, Hertzian contact stress, and root bending stress. The results demonstrated that optimal gear meshing performance was achieved with a modification amount of 15 μm. After modification, the sound pressure levels were reduced by 0.91 dB during forward operation and 0.84 dB during reverse operation of the smart curtain actuator. The analytical method for tooth profile modification employed in this study provides a practical reference for the precision manufacturing and performance enhancement of low-noise gear transmission systems.