This bachelor thesis deals with the issue of the “Directive of the Parliament and the Council ‘European Union’ on public procurement”. Whether public procurement law could prevent the wage and social dumping. It also identifies primary and secondary objectives and tasks of public procurement law. Furthermore, the terms of concepts of wage and social dumping, the causes of social dumping and the consequential damages of the social dumping have been described. For the qualitative investigation, expert - interviews were used exclusively. The conduct and nature of the interviews were based on a guideline for qualitative expert interviews, as the focus is on the hypothesis. During the research, input and the expertise of experts were used, who have many years of expertise and experience in public procurement law. Subsequently, the results were qualitatively thematically categorized and systematically summarized by means of a summary content analysis according to Mayring method. The conclusion of this research is that the European Directive on public procurement is not a proper instrument for combating wage and social dumping. In total, public procurement law can take very restricted and very limited measures against wage and social dumping. Further summary of this investigation even showed that the EU-Directive, with all its requirements and goals, leads the increase in costs and extension of the public procurement procedure.