The invention discloses a device and a method for measuring the local counter electromotive force of an industrial aluminum electrolytic cell. The device comprises a cell interior region side part isolation frame, a melt body interior reference electrode, an anode guide rod voltage probe, high-temperature-resistant copper wires, a high-frequency digital oscilloscope and an interface module. According to the device and the method, the counter electromotive force is measured based on an outage method, local electrolytes of the replaced anode are insulated from the periphery by utilizing a principle that a replaced anode must be powered off when the electrolytic cell is subjected to anode changing, and the counter electromotive force of the local region is accurately measured at the moment when the replaced anode is powered off so as to obtain the counter electromotive force of the local region in the cell can be obtained. The device and the method have the advantages that the counter electromotive force of the local region of the electrolytic cell can be safely and rapidly measured, meanwhile, each cell is measured once every day by utilizing the anode changing period, normal production of the electrolytic cell cannot be influenced, the algorithm of a control system can be calibrated through the counter electromotive force, and therefore the important practical value can be achieved.