The purpose of this study was to investigate the effect of cognitive reconstruction training on body image, social anxiety and suicidal ideation in second high school girl students with negative body image in Khorramabad. The method of the present study is quasi-experimental pre-test-post-test with a control group. The statistical population includes all high school students studying in high schools located in Khorramabad, 30 of whom were selected by multi-stage random cluster sampling from the target community. Data were analyzed through the Multidimensional Self-Body Relationship Questionnaire (MBSRQ), Conor et al Anxiety Inventory, and Beck's Suicide Ideation Questionnaire. The results showed that cognitive reconstruction training reduced body image disorder (F = 57. 80, P <0. 001), social anxiety (F = 98. 02, P <0. 001) and suicidal ideation (F = 27. 99, P <0. 001) in female students that have a negative body image. Therefore, this study provided evidence for the effect of cognitive reconstruction training on body image, social anxiety and suicidal ideation in students with negative body image. Cognitive-behavioral therapy helps teens become familiar with different levels of their thoughts.