With the progress of science and technology and the improvement of people‘s living standards, the performance of traditional materials can no longer fully meet the needs of social development. Graphitic phase carbon nitride (g‐C3N4), as a new type of nanomaterial, has good properties. Its unique graphite like structure and stable thermodynamic characteristics have led an increasing number of researchers to explore its diverse functions and use this as a basis to develop related energy and products for applications in various fields. Among them, applications in the field of medicine health have become popular in recent years. Therefore, this review summarizes the synthesis methods of g‐C3N4 and its composites, as well as their applications in food, medicine, environmental monitoring and disease treatment, in the hope of providing references and basis for further expanding the applications of g‐C3N4 in large health areas.