This paper deeply discusses the characteristics of decorative language in China’s contemporary oil painting art, analyzes its performance in form, color, and composition, and expounds on the application of decorative language in contemporary oil painting practice with specific artists’ works. Through the study of this unique artistic language, this paper reveals the innovation and development of China’s contemporary oil painting in integrating traditional and modern, Eastern and Western artistic elements, and provides theoretical reference and practical enlightenment for the further development of China’s contemporary oil painting art.