Ground flatness detection device with leveling function for roadbed construction

The invention relates to the technical field of roadbed detection, and particularly discloses a ground flatness detection device with a leveling function for roadbed construction, which comprises a movable sliding rail, a flatness detection device and a leveling device. The movable sliding rails are installed on the two sides of the roadbed, and the upper surfaces of the movable sliding rails are parallel to the plane where the roadbed needs to be arranged. The flatness detection device is connected with the movable sliding rail, a detection flat plate is arranged at the end, facing the roadbed, of the flatness detection device, the detection flat plate is parallel to the plane, needing to be arranged, of the roadbed, and the side, away from the roadbed, of the detection flat plate is connected with a marking mechanism. The leveling device is connected with the flatness detection device, the leveling device is located behind the flatness detection device in the moving direction of the flatness detection devic