The powder-spraying gun is a new technical equipment which replaces traditional mildew-proof paper to isolate the glass for packaging. It can not only reduce the production cost but also guarantee the companys economic benefits. It has a good powder-spraying effect and has such advantages as small volume, easy installation and low price. It has reached international level in terms of accuracy and stability. It saves the labor force compared with the traditional paper-laying technology, improves the production efficiency and the automatic level of the equipments.