Compared to ordinary portraits, landscape painting is more complex in terms of color richness and the basic texture of the image. Therefore, the restoration difficulty of landscape painting is also at the highest level. It not only needs to solve the feature interference under multiple colors, but also needs to solve problems such as information loss and the local and global inconsistency of the repair results when repairing large-area damage. In order to improve the effect of traditional landscape painting restoration, this paper proposes a color updating method of traditional landscape painting based on computer color rendering technology, and proposes a new distributed rendering method with parallel processing of logic calculation and real-time rendering, which runs in Sort-First mode and adopts a master–slave structure. Through experimental analysis, it can be concluded that the evaluation results of the color update method combining traditional landscape painting with computer color rendering technology are all above 79 points, with the highest score reaching 88 points, so we can see that the method proposed in this paper has a certain effect.