Road crack detection device

The utility model relates to the technical field of road bridge detection, in particular to a road crack detection device which comprises a bottom plate, a vertical sleeve is fixedly inserted in the center of the upper side of the bottom plate, a hollow measuring rod is slidably connected to the inner side of the vertical sleeve in a penetrating mode, and a measuring probe rod is fixed to the lower end of the hollow measuring rod. A graduated scale is fixed on one side of the hollow measuring rod; and the crack cleaning mechanism is arranged at the position among the bottom plate, the hollow measuring rod and the measuring probe rod. According to the utility model, high-speed airflow is blown into the crack through the crack cleaning mechanism, and the high-speed airflow can blow away silt and sundries accumulated at the bottom end in the crack, so that the end part of the measurement probe rod can be conveniently attached to the bottom of the crack, and the influence on the measurement precision caused by th