Abstract: Under the context of COVID-19 pandemic, this paper analyzes the manifestations and causes of psychological crisis of teenagers, and puts forward the corresponding intervention measures. First of all, it briefly describes the emotional, cognitive, behavioral and physiological manifestations of adolescent psychological crisis under the influence of the epidemic. Secondly, it analyzes the causes of adolescent psychological crisis, including induced events and internal causes. The induced events include the epidemic situation and various changes caused by the epidemic, academic pressure, interpersonal relationship, etc.; the internal root causes include the internal conflicts and psychological difficulties in the growth of teenagers. This paper focuses on three psychological dilemmas:the anxiety environment and the nature of pursuing safety, the controlled environment and the demand of self -control, the virtual environment and the pursuit of life experience, and analyzes the aggravation of the epidemic situation on the psychological dilemma of teenagers. Finally, this paper puts forward the intervention measures for the psychological crisis of adolescents under new coronavirus pneumonia epidemic situation, including the evaluation of psychological crisis, the intervention of psychological crisis and the prevention of psychological crisis.