Understanding the role of languages in the modern world poses before us the question of teaching languages and raising the level of language teaching. Polylingual education in the Republic of Kazakhstan today is one of the main directions in the secondary education system. The aim of our study was to theoretically substantiate, develop and experimentally test the methodology for the formation of the polylingual personality of pupils in the process of organizing extracurricular work in a general education school. The research conducted an experimental and pedagogical work and analysed the collected data using comparative analysis and statistical methods such as percentages. The results of the research proved that the proposed theoretical foundations and methods of organizing extracurricular activities are useful in the formation of the polylingual personality of pupils.