The article covers the issue of continuous professional training of teachers, which is a complex, coherent process, aimed at ensuring the permanent adaptation of teachers to the dynamics of education processes and systems, promoting a proactive attitude, specific to a lifelong learning horizon. The research paper specifies the defining characteristics of the continuous professional training process, describes the principles and objectives of continuous teacher training, determines the content, methodology, forms of continuous teacher training, and elucidates the trends in continuous professional training of teachers.