The goal of the study is to identify the essence of the category “human capital” as a production modern dominant factor by the trends of the knowledge economy formation and the influence of the system of corporate professional staff’s training based on digital tools used on the strengthening of the formation and use human capital mechanisms in Ukraine. The authors have studied the human capital characteristic features, distinguishing it from other types of main capital. A SWOT analysis of Ukraine’s human capital development state was carried out, and its key determinants were formed. The conceptual system provisions of corporate professional training for personnel have been developed, including the principles of formation, digital tools and technologies of professional training, and current methods of training personnel. As a result of the study, the authors presented proposals of changes for implementation into the Tax Code of Ukraine and Concept for the development of digital competencies and use of advanced digitalization tools for enterprises to increase the efficiency and improve the efficiency of professional training for personnel based on the development of a daily initial digital environment.