The invention discloses a corrosion fatigue performance testing device. The corrosion fatigue performance testing device comprises a heating furnace, an upper force applying table, a lower testing table, a testing box, a sealing cover and an electrochemical working station, wherein an opening is formed in the upper end of the testing box, the sealing cover is buckled with the opening in the upperend of the testing box, the lower testing table penetrates through the bottom of the heating furnace and extends into an inner cavity of the heating furnace, the testing box is mounted at the top of the lower testing table and is located in the inner cavity of the heating furnace, and the upper force applying table penetrates through the top of the heating furnace and the sealing cover and extendsto an inner cavity of the testing box; and a detachable electrode group for testing the electrochemical performance is arranged in the testing box and is connected with the electrochemical working station through a lead. According to the corrosion fatigue performance testing device, the overflowing of a solution in a clamp can be avoided, a constant-temperature sealed corrosion fatigue environment is provided, the synchronous measurement of mechanical properties and electrochemical parameters can be realized, and the corrosion fatigue test can be carried out in a high-temperature fused salt environment.