Method and device for measuring polarization potential of test piece

The invention provides a method and a device for measuring polarization potential of a test piece. The method comprises the following steps: acquiring first alternating current source information; performing current information acquisition on the first test piece to obtain a first alternating current value and a first direct current value; performing information acquisition on the first test piece to obtain a first alternating voltage and a first potential to ground; a first alternating current source is set to be in an on state, current information collection is conducted on the first test piece, and a second alternating current value and a second direct current value are obtained; performing information acquisition on the first test piece to obtain a second alternating voltage and a second potential to ground; setting the first alternating current value, the first direct current value, the first alternating current voltage and the first potential to ground as first record data, and setting the second altern