Disclosed are an apparatus and a method for preparing hemostatic gauze with high stability and absorptivity. The apparatus includes a tank body, a tank cover matching the tank body, stainless steel plates within the tank body, an ultrasonic generator under the tank body, a feed pipe and a liquid outlet, where the tank cover is arranged with an air inlet and an air outlet, and the feed pipe, the air inlet, the air outlet and the liquid outlet are all equipped with a valve respectively.
