The utility model relates to a steel catenary riser bottoming vibration experiment system. The system is characterized by comprising a seabed simulation flow making device, a support frame and a riser movement device; the seabed simulation flow making device comprises a trough, and clay is paved in the trough; the support frame spans the front part of the trough and comprises a framework consisting of upright posts and cross beams, four optical levers arranged at the top of the framework and a transverse ''H''-shaped steel plate; the riser movement device comprises a movable plate connected with the output end of a hydraulic cylinder, the movable plate is provided with a slide rail, the slide rail is provided with sliding blocks, the two sliding blocks at the same end are connected with a movable frame together, and one movable frame is connected with the output end of the hydraulic cylinder; and a slide rail is arranged in the two movable frames respectively, the two slide rails are provided with a sliding block respectively, the tops of the sliding blocks are connected with a bottom plate together, the center of the bottom plate is fixedly provided with a connecting rod, and the bottom of the connecting rod is connected with a riser joint. Response property and fatigue property of bottoming vibration can be obtained by measuring acceleration signals and stress signals of different section positions of a pipeline model.