Mental health for young children, who are the to-be ambassadors of the nation, is quintessential. A variety of psycho-social and health problems affect learning and performance in profound ways. From learning disabilities to autism and Down’s Syndrome, as well as increasing episodes of depression, school refusal, and panic attacks among school children require expanded intervention. Without keen alertness, the children get punished – that correlates with school failure. These problems aggravate as children internalize the debilitating effects of performing poorly at school. Thus, there has been a prolonged practice of assisting teachers to equip them to handle issues at school. A total of 100 school students in the age group between 12-13 years were selected using Systematic Random sampling technique. Pre-test was conducted using a structured questionnaire on knowledge of school students regarding positive mental health in selected schools followed by planned health teaching. Post-test was carried out on the 7th day after administration of planned health teaching. In the pre-test, majority of 97% of the subjects had average knowledge (score9-17) and 2% of the subjects had poor knowledge (score 0-8) regarding positive mental health. Interestingly found that 1% of the subject has good knowledge regarding positive mental health. On the other hand in post- test, all the subjects has 100 % good knowledge (score 18-25). Interestingly found that none of the subjects had average and poor knowledge regarding positive mental health. Which indicate that the planned health teaching programme is effective in improving knowledge of school students regarding positive mental health.