The article substantiates the relevance of socio-cultural transformations in determining the strategy of education digitalization. The need for a digital educational space for professional training of teachers on the basis of digital transformation of the didactic process is revealed. Using the results of theoretical research, the factors and patterns of the digital educational process are identified: requirements of the digital economy to teachers, the didactic potential of modern digital technologies, the need for the pedagogical management of network generation Z socialization and instrumental approaches. The leading ideas of the approaches made it possible to present the features and main provisions of the subject-oriented digital educational environment for professional training of teachers and formulate its main components. Considering the content of the didactic space in the professional training of teachers, it is advisable to correlate it with methods, tools and digital technologies that create new opportunities for the educational process and a wide range of educational tasks. The organizational, methodological and substantive aspects of digital transformation of the didactic space are discussed. The methodological tools for professional training of teachers based on flexible transformation depending on professional and personal interests, as well as the saturation of the digital educational environment, are described. Digital transformation involves qualitative changes in the content and organization of the educational process, methods, forms, technologies, the role of the teacher in accordance with the conditions, capabilities, resources of the digital environment for self-realization and personal and professional development of educational subjects.