Aiming at the attenuation problem in the scattering transmission of ultraviolet light on the sea surface, a Monte Carlo simulation model based on partially uniform sampling is proposed. The model takes into account the low visibility caused by the high concentration of particles in the air at sea level, and adopts the importance sampling method for the distance parameter and the uniform sampling method for the zenith angle in the direction parameter. The simulation results show that compared with the traditional Monte Carlo simulation model, the proposed model significantly improves computational efficiency while maintaining the same performance. The computational efficiency is improved by approximately five orders of magnitude, making it very suitable for practical transmission scenarios involving distances on the order of kilometers at sea.