Abstract: A device and method for preparing an aerogel blanket, are described. The device for preparing an aerogel blanket includes: a first transport means configured to transport a blanket substrate; a first spray means configured to spray a sol to the blanket substrate on the first transport means; a second transport means arranged downstream of the first transport means and configured to transport the blanket substrate sprayed with the sol; and a second spray means configured to spray a gel catalyst to the blanket substrate on the second transport means. The device and the method for preparing a aerogel blanket can improve the preparation efficiency of the aerogel blanket.