This thesis aims to explore the application of emotional interaction design in public welfare posters, discussing how public welfare posters, as important tools for transmitting social values and changing behaviors, have always carried profound significance. With the rapid development of digital technology, traditional static public welfare posters have gradually transformed into more interactive forms, and emotional interaction design has shown great potential in this process, significantly enhancing public attention and participation. This study aims to explore the combination of interaction technology and emotional design to enhance the emotional expressiveness of public welfare posters, deepen the emotional resonance of the audience, and thereby improve their communication effectiveness. The research methods will include literature review, case analysis, experimental design, and user research to comprehensively analyze the practical application and value of emotional interaction design.