The invention discloses an installation method of a passive ultra-low
energy consumption building outer window. The installation method comprises the following steps that A, a tongue-and-groove is formed in a concrete wall towards the exterior of a building; B, an auxiliary frame is installed, specifically, the auxiliary frame is placed at the position of the tongue-and-groove to be installed; C, a finished fixed window is installed, specifically, firstly, a window frame is fixed to the concrete wall through fixing pieces, the self-adhesion part of an indoor waterproof vapor-proof film is adhered to the window frame along the periphery of the window frame, and the finished fixed window is installed above the auxiliary frame from the interior of a house; D, indoor waterproof vapor-proof film construction is performed, specifically a waterproof
adhesive is used for fully adhering the waterproof vapor-proof film, and then the waterproof vapor-proof film is adhered to the concrete wall along with the window frame; E, outdoor waterproof and breathable film construction is performed, specifically, after the finished fixed window is installed, the waterproof
adhesive is used for fully adhering the waterproof and breathable film on the outdoor side, and the side, facing the outdoor, of the auxiliary frame is coated with the waterproof and breathable film; F, an outdoor side
window sill is installed; and G, heat preservation layer construction is performed, specifically, after an outer window is installed and a through-wall pipeline is installed, a heat preservation layer is installed, and installation of the outer window is completed.