Taking into consideration the dynamics of changes in the modern labor market, the issue of building career capitals by university graduates, becomes the subject of research, the exploration of which results in a thorough diagnosis of the mismatch problem or inadequate use of the potential of future employees. The career capital structure can distinguish its various types such as educational capital. Despite the fact that educational capital as a single factor, is not enough for achieving the professional success (or even to gain and maintain employment), on the stage of a knowledge-based economy, education is an essential condition for increasing human capital, both in the national, organizational and individual aspect. The main aim of this article is to present the essence and types of career capital with special consideration for educational career capital and also to outline selected determinants of building educational career capital by higher education graduates. The analysis was based on data on students and graduates of higher schools in Poland from the academic year 2017/2018. The methods used in this article are: critical analysis of the content of documents with statistical data as well as analysis and verification of the national and foreign literature on the subject.