"Curriculum-based ideological and political education" has been widely promoted in China's higher education system as an important path for colleges and universities in the new era to implement the fundamental task of fostering virtue and nurturing talent. However, as the policy was fully advanced, the phenomenon of "symbolic performance" gradually emerged in its implementation process. That is, the curriculum schedule incorporates ideological and political elements on the surface, but in reality, it lacks the organic integration of value guidance and professional education. This article is based on the theories of educational sociology and political semiotics, and constructs a multi-dimensional analysis framework. Systematically explore the typical manifestations, generation mechanisms and deep logic of the "symbolic performance" in ideological and political education courses. Research findings indicate that the current "curriculum-based ideological and political education" is characterized by labeling, templating, and utilitarianism, which are rooted in the mechanized understanding of policy implementation, the one-sided cognitive structure of teachers, and the insufficiency of the institutional support system. In response to the above issues, this paper proposes a practical path of "de-mystification", advocating for systematic optimization at multiple levels such as teaching concepts, teaching methods, evaluation mechanisms, and teacher development: This includes the shift from "label embedding" to "value symbiosis", from "indoctrination teaching" to "experiential learning", from "material assessment" to "effect tracking", as well as the establishment of a dual-mentor support system of "professional + ideological and political". This research aims to promote the return of "curriculum-based ideological and political education" to its essence of nurturing people, and enhance its educational effectiveness and institutional vitality. And it provides theoretical support and practical reference for deepening ideological and political reform in colleges and universities.