The utility model relates to a submerged arc furnace power-saving yield-increase automatic control device, which comprises a regulated power supply 1, wherein the regulated power supply 1 supplies reliable and steady 12 V electricity for all current transducers and voltage transducers, a current transformer, a voltage transformer, a current transmitter and a voltage transmitter substantially converts high voltage and high current to 0-10V voltage which is needed by an acquisition board 10, the acquisition board 10 transports current position (displacement sensor 15) of voltage, current and electrode positions to a host computer 11 through converting modulus, the host computer software calculates a needed control electrode according to a fuzzy decoupling algorithm, and controls the electrode. The submerged arc furnace power-saving yield-increase automatic control device achieves prospective control, increases the quality and yield, saves 7 percent electric energy of unit consumption, and has considerable economic benefit.