A global illumination calculation method and apparatus is provided. The method includes: acquiring at least one of SDF information and illumination information corresponding to each of preselected pixels displayed on a screen, and the SDF information and illumination information corresponding to each pixel are stored in a two-dimensional map formed by mapping a three-dimensional map; and performing global illumination calculation according to at least one of the SDF information and the illumination information corresponding to each pixel. The method solves technical problems of global illumination calculation methods in the related art that a large amount of hardware resources are consumed and the presented image effects are not ideal enough.