This book, devoted to quantum field theory, consists of two parts. The first part, written by prof. A. Sokolov, devoted to quantum electrodynamics, t. e. quantum relativistic theory of electron and electromagnetic field, which are the most developed chapters of modern field theory and elementary particles Considerable attention is paid here not only to the systematic development of the general theory, but also to detailed calculations of individual specific effects, including those associated, for example, with a shift in levels according to the latest vacuum theory and the theory of positronium .. The second part of the book, written by prof. D. Ivanenko , Dedicated to , On the other hand, , analysis of the difficulties of relativistic quantum theory and attempts to overcome them mainly through the introduction of minimum length and nonlinear generalizations; On the other hand, , contains an exposition of a number of questions of the theory of elementary particles and their systems , which go beyond electrodynamics and are related to the consideration of gravity and the meson field.