Background: At the end of 2019, the world faced a phenomenon that plunged all human beings into extreme fear and anxiety. A new type of coronavirus began to spread among people around the world, and this was the beginning of one of the greatest pandemics and its problems in the world. Objectives: The present study aimed to study the effect of Emotion-Focused Therapy (EFT) on reducing post-traumatic stress and depression among Covid-19 patients. The statistical population was all English language students at the University of Tehran who had recovered from Covid-19. A total of three students (with a mean age of 22±2 years old) were selected from those who had recovered from Covid-19 using convenience sampling. Results: The data were analyzed using visual inspection, Reliable Change Index (RCI), and percentage change formula. The results of the study indicated that the mean improvement of post-traumatic stress variable for the three patients in the post-treatment and follow-up was 42.39% and 41.54%, respectively. Additionally, this value for the depression variable was 60.78 and 60.22% in the post-treatment and the follow-up. Conclusion: Based on the results of the study, EFT was effective on post-traumatic stress and depression in students infected with Covid-19. Therefore, it is recommended to use this treatment to reduce post-traumatic stress and depression in patients with Covid-19.