Road flatness detection system

The invention discloses a road flatness detection system in the technical field of road detection, and the system comprises a workbench, the workbench is fixedly provided with a cleaning part, the workbench is provided with a swing part and a detection part which are symmetrically distributed, the workbench is fixedly provided with a moving part, one side of the workbench is provided with symmetrically distributed U-shaped rods, and the other side of the workbench is provided with a movable part. A sliding groove is formed in one side of the U-shaped rod, a fixed rod is arranged on the other side of the U-shaped rod, a rotating rod is rotationally arranged on one side of the U-shaped rod, a first gear is fixedly arranged on the rotating rod, the swing part comprises a Z-shaped rod, vertical plates distributed in an array mode are fixedly arranged on one side of the Z-shaped rod, an arc-shaped groove and a vertical groove are formed in one side of each vertical plate, and the vertical grooves communicate with