This paper considers forming the professional competencies of students of the faculty of foreign languages of the teacher training university in the multilingual context. The study used the following methods: a conversation with students and teachers, participant observation, a questionnaire survey (99 respondents), methods of mathematical statistics for the processing of empirical data, study and analysis of current publications on the topic. Data were received on students' competence in languages; the prevailing issues in learning a second foreign language at different stages (courses) of training were revealed. The paper analyzes the results of applying the methodology of training a foreign language teacher based on the co-studying of languages and the implementation of the multilingual approach to the formation of students' professional competencies in the process of curriculum training and pedagogical practice at school. Statistical processing of the obtained data confirmed the positive impact of the applied training methodology on the formation of professional competencies of future foreign language teachers.