The invention relates to a vertical stirring vacuum furnace. The prior vertical vacuum furnace provided with no rotary stirring devices is not easy to remove lead, zinc and other volatile impurities during production, thereby affecting the purification degree of metal products, and is long in cycle of production process flow and incapable of saving energy and protecting environment. The vertical stirring vacuum furnace comprises a rotary stirring device arranged in a vertical vacuum furnace, namely the centre above a bell jar at the upper end of a vacuum furnace body is provided with a motor and a decelerating device which are connected with a stirring gear in a vacuum inner furnace through a connecting device and a stirring rod so as to finish the production processes of stirring and purifying. The vacuum furnace has the advantages of simple structure, use convenience, short cycle of production process flow, good product quality, high production efficiency and effects of not only saving energy but also protecting environment.