Abstract: An electrochemical testing device for a specimen includes a receiving member, an auxiliary electrode, a work module, a clamping module, and a reference electrode. The receiving member receives an electrolytic solution and includes a surrounding wall having a bottom open end. The auxiliary electrode is mounted in the receiving member. The work module holds the specimen and includes at least one upper plate covering the open end to close the receiving member and having an opening connected fluidly to an interior of the receiving member, a lower plate, a work electrode plate interposed between and contacting the upper and lower plates, and a test specimen holding site provided at the work electrode plate and connected fluidly to the opening. The clamping module clamps the work module against the surrounding wall. The reference electrode is disposed in the receiving member above the work electrode plate.