ISIS is a terrorist and Takfiri group that is affected by the teachings of Wahhabism, especially Muhammad ibn Abd al-Wahab's teachings. ISIS and Wahhabism have one proclamation which is the book "Navaghezal-Islam"by Muhammad ibn Abd al-Wahab. This book paves the way for these terrorist groups to accuse other Muslims to Heresy. ISIS period is just like the period of Muhammad ibn Abd al-Wahab's first period. The ISIS confess that we try to resemble the Muhammad ibn Abd al-Wahab and his disciples. If anyone reads the "Annabaa weekly" published by ISIS, can understand this point. One of the contemporary scholars, Hasan Bin Farhan al-Maleki, in one of his books named "the roots of ISIS" says that the ideology of ISIS is derived from Muhammad ibn Abd al-Wahab's ideology. In this research, by a descriptive-analytic method the effects of Muhammad ibn Abd al-Wahab ideology on ISIS will be discussed.