Problem setting. The European Union has long been paying special attention to stimulating innovative activity through the use of public procurement. This is emphasized both in EU directives in the field of public procurement and in specific program documents regarding the development of innovations in the European Union, in particular the new wave of deep technological innovations. At the same time, in Ukraine, the public procurement institute is currently used only as a tool for saving public funds and preventing corruption. Thus, there is a need to study the issue of public procurement as a means of state regulation of innovations in general, as well as a possible tool for stimulating deep technological innovations in Ukraine, including, considering the experience of the EU, in particular, and for the post-war reconstruction of our state. Analysis of recent researches and publications. Some separate aspects of the issue of innovation stimulation through the mechanism of public procurement were given attention in the works – V.K. Malolitneva, L.O. Berezovska, A.V. Kyrychenko, S.R. Karpenko and others. At the same time, the issue of stimulating a new wave of deep tech innovations, using the instrument of state procurement, requires a more detailed study as a separate phenomenon, including in the aspect of harmonizing Ukrainian legislation with EU directives in the field of public procurement. Purpose of the research is to determination of the place of the institution of public procurement as a tool for stimulating the development of deep tech innovations in Ukraine, as well as an analysis of the legal support for the use of public procurement as a regulation of innovative activity in the European Union and in Ukraine, including in the aspect of the need to harmonize Ukrainian legislation with EU rights. Article’s main body. The article is devoted to the study of the issue of legal regulation of public procurement as a means of state regulation aimed at stimulating innovative activity in the European Union. The value of state purchases of ready-made innovative solutions, as well as research and development works, the result of which can be innovative products, is analyzed. The main types of procurement of innovations provided for by European regulatory acts are given. It has been established that the riskiness and capital intensity of deep tech innovations indicate that the main driver, catalyst, and initiator of their development can be the state, using the mechanism of the state order. The issue of legal regulation of the use of the public procurement tool to stimulate the development of deep technological innovations in Ukrainian legislative acts has been investigated. The main legal problems of using such a tool in our country are presented, including in the aspect of harmonization of legislation in the field of public procurement with relevant EU directives. Conclusions and prospects for the development. In Ukrainian legislation, despite its harmonization and adaptation to EU law, there are no special provisions regarding procurement of innovations. At the same time, in the European Union there is a thorough and consistent approach, according to which public procurement an important and effective tool for the development of innovations, in particular, deep tech innovations. Ukraine needs more careful consideration of this practice, since post-war reconstruction requires special innovative solutions that can be found, including, with the use of public procurement.