The invention discloses a corrosion fatigue test device which comprises an upper connecting part and a lower connecting part, wherein a corrosion cavity is formed in the upper end face of the lower connecting part; a lower axial threaded blind hole is formed in the center of the bottom end face of the corrosion cavity; the axial center line of the lower threaded blind hole and the axial center line of the lower connecting part coincide; the upper connecting part is connected with the upper end of the lower connecting part; after the upper connecting part and the lower connecting part are connected, the corrosion cavity forms a sealed cavity; the axial center lines of the upper connecting part and the lower connecting part coincide; a connecting column is arranged at the center of the upper end face of the upper connecting part in a penetrating manner; the lower end of the connecting column is positioned in the sealed cavity; an upper axial threaded blind hole is formed in the center of the lower end face of the connecting column; the axial center lines of the lower threaded blind hole and the upper threaded blind hole are overlapped; an inlet valve and an outlet valve are formed in the side wall of the corrosion cavity in the lower connecting part.