The need to isolate people during the pandemic has put the education system in a situation of transformation of ways of carrying out educational and cognitive activities in conditions of indirect interaction. The transfer of the educational process from the real to the digital environment, including online, without taking into account the specifics of educational and cognitive activity in it, has shown its low effectiveness. Today, digitalization is a priority in the development of education. Ensuring the quality of education in the digital environment requires a fundamentally new approach to the content, motivation, and teaching methods based on scientifically based data on the specifics of the pedagogical process in the digital educational environment. This article presents the results of diagnostics of motivation of educational and cognitive activity of students of various age groups in the digital educational environment according to programs of higher and additional professional education. Within the framework of the study, various methods of motivation diagnostics were used: N.V. Elfimova's methodology for diagnosing educational motivation (adapted in accordance with the age groups of students and the type of training), T.O. Gordeeva's methodology for diagnosing internal and external educational motivation, A.A. Rean's methodology for diagnosing motivation for achieving success and avoiding failures. As a result of the study of the motivation of educational and cognitive activity of students in the digital educational environment according to the programs of higher and additional professional education, the concept of the digital educational environment is clarified, its main characteristics (cross-border, hypertext, individualization, multi-instrumentality, mediated interaction) are highlighted, the concept of motivation of educational activity is clarified, a number of approaches and constructs of educational motivation are analyzed and generalized, presented the results of the diagnosis of the motivation of educational activities of students of various age groups, the experience of implementing the educational process in the digital environment according to programs of higher and additional professional education is summarized. The results obtained in the course of the study made it possible to determine the directions for improving the pedagogical process in the digital educational environment for the vocational education system, taking into account the identified specifics of motivation of educational and cognitive activity of students of various age groups.