Tension and compression fatigue test device for tie rod

The invention relates to a tie rod tension-compression fatigue test device, which is characterized in that a counter-force seat, a gantry frame and a tie rod mounting seat are respectively detachably arranged on a test floor, a hydraulic actuator is arranged on the gantry frame, a tie rod is arranged on the tie rod mounting seat, one end of the hydraulic actuator is fixed on the counter-force seat, and the other end of the hydraulic actuator is fixed on the gantry frame. The other end of the hydraulic actuator is connected with the tie rod through a tie rod mounting seat, the tie rod is subjected to a tension-compression fatigue test through the hydraulic actuator, the tie rod mounting seat comprises a sliding end mounting seat and a fixed end mounting seat, and tie rod fixing holes are respectively formed in the sliding end mounting seat and the fixed end mounting seat; the moving end mounting seat is arranged on the sliding end bottom plate through the sliding block guide rail assembly, the sliding end bott