Currently, smartphones are almost owned by the whole community, starting with children, adolescents, and the elderly. However, the use of smartphones, of course, cannot be separated from the positive and negative impacts on users, especially for students, one of which is about radicalism. Schools in Indonesia in recent years have become targets of radicalism. Thus, it is hoped that the understanding or critical thinking of students can counteract or be a starting point to turn off issues related to radicalism among these students. This study uses a qualitative descriptive approach with data study techniques, as well as data analysis techniques that use data, data reduction, data presentation, and data collection. The results showed that the ability of media literacy in warding off radicalism was at the basic level because the knowledge, ability to analyze and think of Nur Azizi High School students were still limited, however, Nur Azizi High School students were able to carry out functions in operating internet media at various levels. so complex, able to use the internet as needed, and see how to find, obtain, and assess information that is needed but not for messages or information related to radicalism.