Fantasy novels were a type of fictional literature that usually contained elements of magic, martial arts, mythology, and so on. Although the plots of fantasy novels were attractive, their influence on teenagers was not always positive. Some fantasy novels may lead teenagers to become too obsessed with the fictional world and the improvement of magical skills, causing them to neglect important things in real life such as studies, work, and interpersonal relationships. Overindulgence in fantasy novels may also affect the psychology and mood of teenagers, making them anxious, lonely or lack confidence. Fantasy novels could also give teenagers unhealthy values. Some plots in novels, such as fighting, the pursuit of power and wealth, may trigger teenagers 'violent tendencies or the desire to pursue material things. In addition, the mysterious forces and supernatural phenomena that appeared in some novels might also cause teenagers to have unreasonable beliefs or worldviews. Therefore, the influence of fantasy novels on teenagers was complicated and needed to be treated with caution. Parents, teachers and education workers should guide teenagers to read fantasy novels rationally to help them establish correct values and outlook on life.