The present invention relates to a device, method, and smart glasses for color vision deficiency correction. The method includes: adjusting a color of an image according to an environmental color temperature to obtain an adjusted image, and then adjusting a pixel level of the adjusted image to a preset pixel level according to image content, to obtain a to-be-processed image; determining an adjustment matrix based on an RGB value of the to-be-processed image and a preset RGB target value; comparing a color displayed on a display with a color of a standard colorimetric card for correction, to determine an adjustment mapping table; and generating a target image based on the to-be-processed image, the adjustment matrix, and the adjustment mapping table. The present invention increases the degree of color recognition and improves imaging effects, and can implement good color vision deficiency correction.