Modernization of the education system presupposes the process of introducing innovations and the teacher is the main figure in any transformations. The innovative activity of any educational institution, including preschool organizations, is directly related to the teacher's readiness to develop and implement pedagogical innovations in the educational process. Based on the psychological-pedagogical literature review, the definitions of innovative activity, the readiness of future teachers of preschool teachers for innovative activities are presented; its structure is developed as an integrative characteristic of the personality of teachers, including motivational, cognitive and activity-based components, and the levels of teachers’ readiness for innovative activity. The developed diagnostic tools (criteria, levels and diagnostic techniques) were tested in practice in order to identify the levels of readiness for innovative activity among preschool teachers of the initial stage of education.