The article notes that the 6–7 years of children’s life are basic and at the same time the most favourable period in the transition from visual to abstract thinking. The purpose of the article is to actualize and generalize the experience of forming cognitive activity and independence of senior preschool children in the pedagogical system of Maria Montessori. It is noted that the concept of M. Montessori is based on the following: a prepared environment, a prepared adult, a child as an autonomous subject of cognition, and the child’s individuality. The functions of the educator (according to V. Khromets) are characterized as follows: to assist, interest, objectify, and simplify. It was determined that the environment should stimulate cognitive activity and should be prepared in such a way that a child, according to Montessori, would assimilate the “idea of order”. The content of the definition of “cognitive enthusiasm” is determined – the ability of a preschool child to spontaneously react, learnm and remember objects and phenomena of the surrounding reality. M. Montessori called this ability the “absorbent mind” or “absorbing culture”. Methodical recommendations for the use of Montessori materials for the development of cognitive activity in accordance with the following principles are substantiated: materials provide for the possibility of controlling actions, preventing, and correcting mistakes; materials are grouped by educational subjects in activity centres; materials are arranged “from simple to more complicated”; materials are aesthetically pleasing, harmonious and visually structured. It has been determined that internal discipline is the basis of cognitive and subsequently educational self-discipline, which is a formative means of actively directed personality of senior preschooler. To summarize, cognitive independence is an element of the child’s general independence, which is based on natural cognitive powers and abilities, is formed in the space of functional freedom, is regulated by the internal mechanism of self-discipline, and is aimed at developing a self-motivated child capable of self-education. It is pointed out that teachers need to direct the educational process towards the development of the child’s desire to be independent in his/her actions, deeds, and behaviour. Thus, the Montessori approach is relevant in the context of the reformed preschool education content (2021), aimed at its implementation, and can be used by educators in the modern conditions of the educational process. Keywords: preschool education, senior preschool children, activity formation, cognitive activity, cognitive agency, cognitive independence, self-activity, M. Montessori’s concept, pedagogical system.