Co-creation for brand innovation is an intriguing and rapidly growing trend in the current competitive market. Past research emphasizes the economic gains of consumer co-creation, with limited research focusing on the psychological effects engendered in the process of consumer brand co-creation. Drawing from self-determination theory and implicit self-esteem theory, the present research proposes an integrative framework for synthesizing the perceived psychological benefits and distinctive motivations in the brand co-creation process. The results indicated that brand self–connection and three perceived benefits of brand co-creation tasks (autonomy, competence, and relatedness) facilitate consumer motivations to participate in brand co-creation campaigns. These motivations facilitate the establishment of brand co-creation engagement, which in turn leads to strengthened brand relationship behavior. This research exemplifies that a well designed brand co-creation contest is a potent means which can not only enhance consumer engagement with the co-creation contest, but also turn engaged consumers into intangible assets for brand innovation.