This research is motivated by the diversity of Indonesia's multicultural, ethnic and religious communities, as well as multiculturalism. Islamic education that touches on the aspect of morality is Islamic boarding schools. Islamic boarding schools are institutions that istiqamah still maintain the tradition of peace, balance and harmony and continue to develop the principle s of ukhuwahIslamiyah, wathaniyah, and basyariyah in an effort to strengthen the Unitary Republic of Indonesia (NKRI). This type of research is qualitative phenomenological field research. The data in this study consisted of primary data and secondary data. While the technique of collecting data through {a} observation, {b} interview, and {c} documentation. To test the credibility of the data the author uses the data source triangulation technique. Then the data analysis is carried out at the beginning of the research to the conclusion. From the results of the research conducted, it can be concluded that: first, the principle of planting multicultural education in the Ngalah Islamic boarding school is rahmatanlil’alamin {protector for all circles}. Second, the implementation of planting multicultural education in the Islamic boarding school Ngalahala NU which includes 3 morals, namely Wathaniyah {Polite towards the State}, Insaniyah {Compassionate towards fellow human beings}, and Islamiyah {polite to fellow Muslims} and cling to the Pancasila and the 1945 Constitution , through habituation of attitudes, among others: a) Religious (religious), b) Humanist (humanity), c) Nationalist, d) democracye)tolerance with exemplary media caregiver, orientation of new santri, ta'lim ad diniyah, dormitory life, stage art and halaqoh. It was proven by the enthusiasm and istiqomah attitude of the santri in participating in the pesantren activities that had been scheduled starting daily, weekly, monthly and yearly.