Sun glint interference seriously hinders the effective acquisition of object information in the remote sensing field. In this paper， a sun glint suppression method based on polarization information for UAV-borne platform was presented to realize all-weather and all-time detection of underwater military targets in a complex marine background. A light component decoupling model was constructed using the polarization characteristic difference between sun glint and object information light and an unsaturated image set was selected to solve the global polarization information of the scene. Then， the spatial distribution of sun glint polarization state was deduced based on the normalized reflectance of sun glint in a Muller matrix. Further， a source-submarine-detector polarization state transmission model was proposed to estimate the polarization degree of object information light； then， the water attenuation coefficient was used to correct the model according to the physics-based model for passive underwater imaging. Finally， a sun glint suppression method that is applicable to a wavy water surface was realized. The outdoor experimental results show that the region contrast and signal-to-noise ratio of sun glint suppression image are improved by 25.3% and 78.4%， respectively， compared with those of the 90° polarization image. Our method can effectively enhance the characteristics of submarine targets under the interference of sun glint， thus helping our country to better explore the sea.