The invention discloses a continuous electrochemical testing device which comprises a water tank, wherein the upper end of the water tank is provided with a groove; a plastic rod is arranged above the groove; the plastic rod is connected through a connecting groove at the bottom of a plastic disc; two sides of one end of the plastic rod are provided with working electrodes; one side of each working electrode is provided with a reference electrode; and one end of the reference electrode is connected with an auxiliary electrode. The problems that fastening of a sample is loose, the distance between the sample and the electrode is difficult to control, the solution is repeatedly replaced and the like in the experiment can be well solved, so that the experimental accuracy is ensured; and moreover, three even more working electrodes can be prepared in use, the trouble that the sample is replaced each time is avoided, the labor intensity of the experimenter is lightened; and meanwhile, a water outlet plug is arranged on the device, and when the sample is replaced each time, the solution can be poured just by opening the water outlet plug, then a new solution is added, the space of the water tank is large, the interior of the water tank is conveniently cleaned, and the device is novel in design, is a good innovation scheme and has good market popularization and prospect.