Ensuring the process of improving the qualifications of teachers by means of Informatization of education makes it possible to implement scientific and methodological support for teachers in solving actual pedagogical problems. The competence of the teacher, which we regard as pedagogical intentionality, is of particular importance in the context of modernizing approaches to setting educational goals and results. The author presents the results of the study, the purpose of which is to identify the methodological potential of Internet technologies in the development of the pedagogical intentionality of teachers in the process of advanced training. As a leading approach, we used a comparative analysis of the key characteristics of the designed educational system: 1) pedagogical intentionality as the required competence and learning objectives, 2) approaches to adult education, taking into account the characteristics of education subjects and 3) Internet technologies as the intended means of education. Designing a pedagogical intentionality as a teacher’s general professional competence includes a terminological, logical-conceptual and structural comparative analysis of intentionality as a pedagogical and interdisciplinary category. The results of the study made it possible to give a definition of the specified competence, to identify its essence and functions. A theoretical analysis of approaches to adult education revealed that the key characteristics were experience and established opinion, the position of an adult, independence and pragmatism. As a result of the study, an overview of the key characteristics of Internet technologies is presented, demonstrating their essential significance for the elements of the designed educational system. It is argued that the methodological potential of Internet technologies in the development of teacher’s pedagogical intentionality in the process of advanced training is to ensure the processes of figurative perception, verbalization, metacognitive and reflexive understanding through the launch of slow modes, as well as the possibility of creating an emotionally saturated environment and conditions for self-expression and establishment of the author’s position, supporting cooperation procedures on the basis of trust and status equality of educational event participants. The theoretical significance of the research results consists in concretizing the approaches to the use of Internet technologies. Practical value – the ability to use the results of the study in the development of additional advanced training programs for teachers.