The invention relates to a method and device for color noise suppression, and the method comprises the following steps: acquiring the brightness value of a pixel; and adjusting the chromaticity of the pixel according to the brightness value of the pixel, wherein when the brightness value is lower, the pixel needs to be adjusted to have lower color saturation, and when the brightness value is higher, the pixel needs to be adjusted to have higher color saturation. In the method, the color saturation is adjusted through the brightness situation of each digital image pixel, thereby effectively reducing the strength of the chromaticity of the pixels with the lower brightness, and further improving the situation that the higher color saturation or color noise of a digital image can generate adverse effects on the image quality when the brightness of the pixels is lower.