The article provides a review of ideas about social intelligence and information about severity of its various components in primary school age. During this period, the development foundations are laid for the next age stages, and social intelligence is the foundation of personal development. The review given by the authors showed that at the beginning of primary school age, social intelligence is at a low or medium level of development. Throughout the entire age period, the development of individual components occurs heterochronously. The child is consistently mastering social skills and is better aware of himself. At the behavioural level, the underdevelopment of the social intelligence of younger students is manifested in the difficulties of adapting to school life and communicative problems. Thus, social intelligence developed in primary school age ensures the use of optimal behaviours in interaction with others, satisfaction with family and school life.