Today new content, new approaches, new right, other relations are offered. The content of education is enriched by new procedural skills, capacity of operating information and creative solution to the problems of science and practice with an emphasis on individualization of educational programs. In conditions of a multicultural and multiethnic environment before national school there is an important task-teaching schoolchildren along with their native language (Kazakh), Russian as a language of international communication and English as a means of initiation to the world culture. This research is conducted in order to determine effective formation of comprehensive school children's polylingual personality and educational potential of school discipline "Foreign Language" in the problem context. The implementation of objectives of schoolchildren's polylingual personality formation is determined by the system of pedagogically appropriate interactive forms, methods and techniques of teaching and educational work based on modern young pupils' mentality, the specifics of socio-cultural situation of the Kazakh state and international community. The experimental work aims at checking the working hypothesis of the study and achieving high levels of pupils' polylingual personality formation. Authors conclude the efficiency of polylingual personality formation is due to complex of organizational and pedagogical conditions combining: The creation and implementation of software, training and methodological support with account of communicative lingual-cultural orientation, as well as enriching communicative and cultural potential of the educational process subjects.