More and more new forms of behavioral disorders appear in young preschool children. Some of them may indicate the threat of a child’s social maladjustment. The article presents the symptoms and causes of maladjustment in order to enable effective prevention of social maladjustment in pre-school institutions. The aim of the research was also to measure the level of knowledge of preschool teachers about social maladjustment of young children. The survey method was used to do the research. Teachers gave anonymous answers to previously prepared questionnaires. This allowed to gather a lot of honest opinions about the social maladjustment of young children. The collected information has allowed to see that the phenomenon of social maladjustment is becoming more and more common in kindergarten institutions. Kindergartens still lack the opportunity to explore the student’s home environment, and this is necessary to be able to make the correct diagnosis. Many teachers do not see any signs of social maladjustment in their child’s behavioral disorders. Therefore, further investigation of this phenomenon is necessary and making educators aware of its importance.