Energy-saving door and window auxiliary frame and window frame connecting structure and mounting method thereof

The invention relates to the technical field of door and window installation, and provides an energy-saving door and window auxiliary frame and window frame connecting structure and an installation method thereof.The energy-saving door and window auxiliary frame and window frame connecting structure comprises an auxiliary frame and a main frame of a door and window, the main frame and the auxiliary frame are connected into a whole through a plurality of connecting pieces, the connecting pieces comprise male connecting pieces and female connecting pieces, and the male connecting pieces and the female connecting pieces are arranged on the main frame and the auxiliary frame correspondingly; the relative positions of the male connecting piece and the female connecting piece are fixed through the male and female fasteners; the auxiliary frame comprises auxiliary frame inner aluminum, auxiliary frame outer aluminum and a first heat insulation strip, the first heat insulation strip is arranged between the auxiliary