To tackle the influence of a light source in the field of view on imaging, this paper presents a new underwater image restoration method suppressing its interference. The underwater imaging model considering the influence of a light source is first established, and then the light source radiation is separated depending on the different gradient distribution between the image interfered by the light source radiation and the image without the influence of light source. With regard to the acquired image after the interference of light source is suppressed, its global background light and the underwater transmittance are estimated by the maximum filter and the median filter, respectively, which effectively reduces the influence of the light source in the field of view on parameter estimation. The experimental results verify the effectiveness of the underwater image restoration method proposed in this paper, which can significantly improve the visibility of underwater scenes. In addition, this method can also achieve a good effect of underwater image restoration without the influence of light source.