Abstract: To address the shortcomings of China's HY-1 Satellite ocean color remote sensor, such as limited spectral bands, insufficient signal-to-noise ratio, low spatial resolution, inadequate suppression of stray light and polarization sensitivity, and low-precision calibration system, an overall rotating opto-mechanical scanning imaging approach of the advanced telescope was adopted by the new generation ocean color sensor. A rotating off-axis three-mirror system was employed by the remote sensor optical system, eliminating optical system image rotation while enhancing stray light and polarization sensitivity control. A U-shaped frame design was adopted by the opto-mechanical system, controlling the system weight while ensuring system structural rigidity. A grease-lubricated bearing based on MACs was utilized by the opto-mechanical scanning mechanism, ensuring an 8-year lifespan of the mechanism. A full-aperture, full-light-path, back-to-back dual diffuse reflector solar calibration scheme was employed by the calibration device of the opto-mechanical system, guaranteeing the on-orbit lifespan of the diffuse reflectors. The verification results show that the remote sensor using this proposed approach achieves Earth imaging with 18 spectral bands covering 0.35~12.5 μm, signal-to-noise ratio≥1 000, spatial resolution≤500 m, polarization sensitivity≤1.5%, and stray light coefficient≤1% on the CAST2000 small satellite platform. The attitude disturbance of the mechanism to the small satellite platform is less than 0.005（°）/s after dynamic imbalance compensation. The on-board solar calibration accuracy is better than 2%. Because of these advantages, the proposed approach is particularly suitable for multi-band, high-quantification remote sensors on small satellite platforms with promising application prospects.