Objective Through learning the sources and coping style of the nursing students′ negative emotions of Oncology Department during internship, to provide the reference of improving clinical nursing teaching. Methods Using phenomenological research methods, we took a depth interview of 10 students, analyzing their real feelings, experiences of their negative emotions, and coping style during internship. Results Five themes were summarized as follows: distrust of patients, lack of psychological adjustment ability, overloaded work, huge clinical teaching requirement, and occupation hazards stress. Facing these negative emotion, nursing students should cope with multiple methods with positive attitude. Conclusions Focusing on Oncology Department students′emotion experience, we should give psychological counseling in time, use effective methods to promote students′physical and mental health, create a innovation teaching mode, and improve the effect of clinical intern.