Drop hammer type pavement detection deflectometer

The utility model relates to the technical field of deflectometers, and provides a drop hammer type road surface detection deflectometer, which comprises a deflectometer body and a mobile platform, the mobile platform comprises a bottom plate, a push rod and a plurality of rollers, the deflectometer body is fixedly connected with the bottom plate, a plurality of lifting mechanisms for adjusting the horizontal height of the bottom plate are arranged in the bottom plate, and the push rod is arranged in the bottom plate. A fixing mechanism for fixing the deflectometer body is arranged on the bottom plate, a rotating mechanism is arranged between each roller and the bottom plate, the rotating mechanism comprises a rotating block, a rotating shaft and a rotating groove, the rotating groove is formed below the bottom plate, the rotating shaft is rotatably connected with the rotating groove, the rotating block is linked to the rotating shaft, the rollers are fixedly connected with the rotating block, and an opening