Wide-range air leakage detection device with micro flow measurement function

The invention discloses a wide-range air leakage detection device with micro flow measurement, and relates to the technical field of air leakage detection, the wide-range air leakage detection device comprises an air flow measurement device and an automatic pressure-stabilizing ventilator, and an air outlet of the air flow measurement device is connected with an air inlet of the automatic pressure-stabilizing ventilator; the air flow measuring device comprises a measuring pipeline, a small nozzle, a middle nozzle and a large nozzle which are sequentially connected in a sleeved mode are arranged in the measuring pipeline, the large nozzle is fixed in the measuring pipeline, and the small nozzle and the middle nozzle are both arranged in the measuring pipeline in a sliding mode and driven by a driving mechanism to slide so as to be used for changing the air circulation section of the measuring pipeline. According to the invention, the range broadening covers all air leakage grades specified by a new regulation