The main purpose of the article is to form a mechanism for public administration of the planning system for the sustainable development of the region in the context of digitalization. To achieve the goals set, the method of graphical construction of the functional mechanism was used. The use of this technique made it possible to depict in detail the process of achieving the final goal. In addition, a significant advantage of this model is that the modeling system takes into account the functional relationships of the stages and the main elements of the system necessary to achieve the ultimate goal. The relevance of the study is given by the factor of active discussion of the public administration system and consideration of its significance for the sustainable development of the region. Based on the results of the study, the main functional mechanism of state management of the planning system for the sustainable development of the region in the context of digitalization is presented. With the help of the constructed mechanism of state management of the planning system for the sustainable development of the region, public administration authorities will be able to better plan their activities and increase the efficiency and speed of digitalization processes. The study has limitations and whether they are related to the narrowing of the analysis by focusing solely on the system of public administration in the region. Further research should be devoted to the problems of the direct implementation of this mechanism in the planning system for the sustainable development of the region.