Coupling multi-electrode array corrosion online monitor and working method thereof

A coupled multi-electrode array corrosion online monitor comprises a controller, and the controller is electrically connected with a plurality of current measuring units and a plurality of voltage measuring units. The voltage measuring units are electrically connected with the reference electrode; each electrode is connected with a corresponding current measuring unit and a corresponding voltage measuring unit through a first relay, and the electrodes are switched between the electrical connection with the voltage measuring units and the electrical connection with the current measuring units through the first relays. The working method of the coupled multi-electrode array corrosion online monitor comprises the following steps: starting up and electrifying, operating the controller, and uploading data. According to the embodiment of the invention, the controller measures the signal of each electrode at the same time through each current measuring unit to obtain corrosion data at the same moment, so that an acc