The aim of the study is to identify the characteristics of social intelligence in children aged 6 to 7 years based on the development and application of appropriate diagnoses. Through methods of comparison, analysis, generalization, the concepts of “social intelligence of children aged 6 to 7 years”, “pedagogical diagnosis of social intelligence aged 6 to 7 years” were developed. Modeling provided the creation of the model of relationship between intelligence and social intelligence, the design made it possible to develop the diagnosis of social intelligence for children aged 6 to 7 years, and experience - its implementation. By the method of finding indicators of generalization, the results of the diagnosis of social intelligence of 110 children were selected. Analysis, interpretation and generalization allowed to identify the characteristics of this diagnosis and the characteristics of the results of its application. The concepts of "social intelligence of children aged 6 to 7 years", "pedagogical diagnoses of children aged 6 to 7 years", a model of the relationship between consciousness and social intelligence, social intelligence diagnoses of older preschoolers were developed. The characteristics of social intelligence of children aged 6 to 7 years and the corresponding diagnostic characteristics are revealed. The results of the study will allow for pedagogical work based on the characteristics.