A power-saving facility of a submerged-arc furnace comprises three phases of compensating circuits; the three phases of compensating circuits are respectively connected with a secondary side of an electric furnace transformer through a short net of a compensation system; the short net of the compensation system is connected in series with a quick fuse and a reactor; each phase of the three phases of compensating circuits comprises a capacitor; the capacitor is connected with the short net of the compensation system through a connection conducting wire, so as to form a static compensator. The power-saving facility has the advantages of greatly improved power factor, high production efficiency and low production cost.