The sun glint on the water surface leads to flares in the optical images and loss of ship target detail information. This paper presents a method of suppressing sun glint on water surface by combining polarization filtering and polynomial fitting. In an imaging optical path, a polarizer is used to filter the glint based on the polarization characteristics of sun glint reflected from the water surface, and the glint areas in the polarization filtering images are estimated through polynomial fitting estimation. The water surface glint polarization imaging experimental device lint is constructed, and the polarization filtered image of the water surface glint is acquired. Polynomial column direction curve, row direction curve, surface, and line-by-line polynomial curve fitting methods based on the least square method are used to process the polarization filtered image. The experimental results show that using a polarization filter in conjunction with a line-by-line polynomial fitting method can effectively remove the sun glint while also making the processed image brightness more natural, not including saturated pixels and highlighting the details of the ship targets.