Municipal road asphalt pavement flatness detection device

The utility model discloses a municipal road asphalt pavement flatness detection device which comprises a fixed frame, a plurality of movable rods are movably arranged at the bottom of the fixed frame, balancing weights are fixedly arranged at the bottoms of the movable rods, walking wheels are fixedly arranged at the bottoms of the balancing weights, the rear side ends of the movable rods are meshed with tooth columns, and the tooth columns are meshed with the movable rods. A toothed plate is meshed with the surface of the toothed column, and a marking pen is fixedly arranged at the rear side end of the toothed plate. A plurality of walking wheels are matched with a balancing weight to drive a movable rod to move up and down, then the movable rod drives a toothed plate to move up and down through a toothed column, the toothed plate drives a plurality of marking pens to write up and down on the surface of writing paper, and meanwhile a first winding roller and a second winding roller rotate relatively to driv