The article proposes the concept of transformation of the assessment of the quality of educational activities and the training of future science teachers, the main ideas of which are the objectivity of the assessment; its complex nature; the technological nature of the assessment procedures; their openness; the unity of normative and "non-normative" criteria. It is established that the transformation of the assessment of the quality of educational activities and the training of future science teachers necessitate a comprehensive transformation of its content, instrumental and technological characteristics. The technology of transformation of the assessment of the quality of educational activities and the training of future science teachers in the context of the pandemic has been developed, which involves the implementation of three interrelated stages -- preparatory, main and final. Its implementation will ensure the adaptation of the assessment of the quality of educational activities to the changed conditions of education; the formation of the subject position of the student in the conditions of informatization of educational activities; improving the quality of professional education by individualizing the content of the assessment of the educational activities of future science teachers, as well as the variability of the assessment procedures used in its implementation. On the basis of expert assessments, proposals for the transformation of the assessment of the quality of educational activities and the training of future science teachers are formulated. Their implementation will allow not only to quickly identify problems in the content and procedural aspects of professional education of future science teachers, but also to timely determine the directions for improving its conditions.