Mentoring activity is one of the important factors in the development of professional competence of future teachers. Mentoring skills acquired during their studies at a university significantly expand the opportunities of young people who have chosen the teaching profession. In this regard, an important aspect of educational activities in pedagogical universities is attention to predictors that mark the effectiveness of acquiring mentoring skills among students. The most important predictors of mentoring activity are: psychological, characterizing the individual qualities of students, and professional, including the experience of mastering special additional educational programs, technologies, and practice-oriented acts of interaction in the mentor-mentee system. These predictors are interrelated and together make it possible to predict the success of mentoring activity. The purpose of the article is a theoretical analysis of the predictors of mentoring activity, characterization of the qualities that contribute to the effectiveness of this activity among students, and presentation of the results of the empirical survey. The core of the research activities were psychological and professional predictors of mentoring activities of student youth. The material for the analysis was the personal and professional qualities of students with different experiences of immersion in mentoring during their studies at a pedagogical university. The research data showed that there are differences in the personal and professional qualities of respondents who are consciously focused on mentoring activities, have been trained within the framework of a special additional educational course, actively participated in volunteer activities, etc., and student respondents who do not highly appreciate the value of mentoring for the future profession of a teacher. General qualities: moral and ethical guidelines, altruistic vector of behavior, orientation towards mutually beneficial communication