Building external window on-site air tightness detection equipment

The utility model relates to the field of air tightness detection equipment, in particular to building external window on-site air tightness detection equipment, which comprises a detection frame, the detection frame comprises a mounting layer, a blowing layer and a detection layer, the mounting layer is positioned between the blowing layer and the detection layer, the bottom of the mounting layer is provided with a lower window frame, and the top of the detection frame is provided with a hydraulic motor. The building external window detection device is simple and convenient in structure, multiple devices can be assembled for use, on-site assembly of multiple devices is facilitated, use is more flexible, and therefore the building external window detection device is more suitable for being used in a construction site, a building external window is placed in an installation layer in the use process, and the building external window detection device is more convenient to use. The lower window frame is attached