Abstract
the article presents a program for training preschool education specialists in multilingual groups to work with children in kindergarten in three languages and a program of psychodiagnostic work to identify the features and level of actual development of mental cognitive processes in children, reflecting the particularities of mastering trilingualism, in order to determine the ways developmental work. The article presents the methods of psychodiagnostics of cognitive processes: attention, memory, thinking, imagination and speech. The training program for preschool education specialists in multilingual groups is a comprehensive course that includes classes in Russian, Kazakh and English and includes a plan for the educational work of a teacher-educator in Russian. The plan includes the topics and goals of each day for a full calendar year of educational work in a preschool institution. The proposed system of work on teaching the language of preschoolers can be effectively used in the practical activities of kindergartens, regardless of the profile of their activities and focus.