The utility model discloses a FRP pipe hoop bending fatigue test device, including support base, the punishment of support base four corners position do not is provided with a vertical smooth guide pillar, by the lower supreme pressure testing board that has set gradually on the smooth guide pillar, intermediate bottom and lamina tecti, pressure testing board and smooth guide pillar sliding fit, adjustable locator about between intermediate bottom and the lamina tecti, the last hoop bending displacement width of cloth adjusting box that is provided with of intermediate bottom, hoop bending displacement width of cloth adjusting box one side meets with the axis of rotation of fatigue test motor, its opposite side is provided with the fatigue test axle, the axis of rotation and the fatigue test axle disalignment of fatigue test motor, the epaxial articulated vertical pressure testing axle of fatigue test, be provided with on the pressure testing board and articulate the seat with pressure testing axle articulated. The utility model discloses can say to FRP pipe specially and avoid the fatigue test who carries out a lot of, high frequency FRP pipe to say and the fatigue crack problem appears, prevent to cause that the seepage and the problem of increase maintenance cost appear for the FRP pipe that the installation was used says that the quality is more secure.