This article is devoted to the study of the characteristics of socio-psychological adaptation of high school students with different levels of Internet addiction. The paper examines the phenomenon of Internet addiction as a variation of behavioral addiction in the context of information security. The study involved 120 high school students from municipal educational institutions in Moscow. Two diagnostic methods were used: Chen Internet Addiction Scale - CIAS adapted by V.L. Malygina, K.A. Feklisova; Test of Personal Adjustment by Carl R. Rogers, Rosalind F. Dymond (adapted by A.K. Osnitsky). As a result of the conducted empirical research, significant differences in the components of socio-psychological adaptation of schoolchildren with different levels of Internet addiction have been shown; it has also been proved that Internet addiction acts as a predictor of adaptation of high school students.