For solving the problem of long controlling temperature time and low precision by traditional liquid bath based copper strip corrosion testing apparatus. A new copper strip corrosion tester is designed based on metal bath temperature control technology. The apparatus is mainly used to test the corrosion of copper strip at specific temperature. The testing results show that the apparatus has few features including low fluctuate thermal field, even heat and high working efficiency. It is able to be widely used in copper strip corrosion tests