The problems of preserving the language and culture of small ethnic groups are relevant in world society. The Yukaghirs are one of the disappearing ethnic groups due to their small number and long-term adaptation in a multi-ethnic environment that does not contribute to the development and preservation of linguistic and cultural traditions. The lack of a language environment, scientifically grounded educational programs and teaching materials, violation of psychological foundations that contribute to the preservation of an ethnic group are the main bases of the relevance of the study. The article presents the results of a long-term educational experiment on the preservation of the Yukaghir language and culture in the Nelemnoye secondary school of the Verkhnekolymsky district of the Republic of Sakha (Yakutia), the successful management of the educational process in the new conditions, its progressive expansion, development, and creation of a socio-educational space to preserve the native language and culture in the Yukaghir village. The practical results of the experiment can be used to solve similar problems in the world's educational society.