The declared technical solution belongs to the field of construction, namely to the methods of formation of nodes of connection of enclosing frame structures from profiles based on polyvinyl chloride. Such a solution can be applied when combining in one line, in particular, window boxes, doors, partitions, showcases, stained-glass windows, gates installed in residential, public, industrial, auxiliary buildings and structures both indoors and outdoors. The connection of the profiles of frame structures with the help of a plastic connecting element in the form of a profile with two symmetrical longitudinal grooves directed in opposite directions with protrusions-hooks is carried out by inserting the ribs of the mounting walls of the profiles of frame structures into the grooves of this connecting element. The specified connecting element is installed on the mounting ribs that are closest to the outer front walls of the frame structures profiles, which are opposite to the shelter walls, while, according to the declared solution, aluminum overlays are installed on the outer front walls of the frame structures profiles, which are shelters in the form of a profile, the longitudinal ends of which contain protrusions-hooks that ensure engagement with the longitudinal ends of the outer front wall of the profile of the frame structure. One longitudinal end of the profile of the aluminum overlays has a longitudinal groove, and the inner surface of this profile has a longitudinal support rib to ensure the spacing of the aluminum overlay relative to the outer face wall of the profile of the frame structure. An aluminum connecting element in the form of a strip is inserted into the longitudinal grooves of the aluminum linings located opposite each other. And after installing the above-mentioned aluminum overlays with an aluminum connecting element and a plastic connecting element, the frame structures are tightened with threaded fasteners