Thick painting technique is an expressive creative method in oil painting. With the thick accumulation of pigments, the three-dimensional shaping of texture, and the emotional expression contained in brush strokes, the visual style and spiritual connotation of contemporary landscape oil painting are reconstructed. In terms of the development process of art history, the thick painting technique has gradually gotten rid of the function of simply reproducing objective things and turned to express emotion and spirit in depth from the embryonic stage of the classical period, the development of impressionism period, and the maturity of the contemporary era. In the process of contemporary landscape oil painting creation, artists use the material characteristics of the thick painting technique to integrate the objective form of natural landscape with their own subjective emotional experience, and convey natural artistic conception, life philosophy, and cultural feelings through the construction of texture, brushwork, and color. Based on the contemporary artistic environment, this paper deeply analyzes the artistic characteristics of thick painting technique and its function as an emotional carrier, explores the internal relationship between thick painting formal language and emotional core, comprehensively explains its aesthetic value and spiritual significance in contemporary landscape creation, and gives the corresponding emotional expression practice path, providing professional reference and academic opinions for perfecting the theoretical system of emotional expression in contemporary oil painting landscape and guiding artistic creation practice.