The article reveals the role of the poster, which at the beginning of XXI century doesn’t lose the position of the main advertising medium for outdoor (especially in city lights), in interiors for various purposes, even as an element of the decor instead of paintings, in virtual competitions of various themes, and can be transformed into online ads banners. Purpose of the study is environmental social advertising, an empirical analysis of visual language and stylistic trends in the poster was conducted. The research methodology is based on rethinking the results of the International Project “ECO-Culture”, whose objectives were the development of eco-thinking, popularization of eco-trends, the formation of poster art a new lifestyle in an urban environment, promoting the concept of clean cities and consumer culture. In this way, the role of education, art and design and the responsibility of each of us in the systemic changes for the environment is proved. To achieve this goal, scientific methods were used: system-structural, socio-cultural, axiological, comparative, method of theoretical generalization. Scientific novelty. Ecoposter has been actualized as a form of socio-cultural communication, strategically aimed at preserving the environment and creating comfortable conditions for human life and activity, changing consumer attitudes, strengthening social responsibility and positive values. Conclusions. The current state of ecoposter, in particular in Ukraine, motivates further initiatives and interdisciplinary approach to the development of ecoculture in society by means of Poster Art. In the arsenal of techniques to increase the efficiency and aesthetic level of ecoposters, the authors highlighted the use of creative advertising technologies – visual metaphors, hyperbole, associations, allegories and metonymy, focusing on the experience of famous poster artists and participants in international exhibitions and competitions.