Cement concrete pavement void detection device

The utility model relates to the field of highway pavement detection, and particularly discloses a cement concrete pavement void detection device which comprises a mobile vehicle body, a void detection main body is arranged on the mobile vehicle body, and a starting key, an information processor and a continuous knocking device are arranged on the void detection main body. The continuous knocking device and the starting key are electrically connected with the information processor; the continuous knocking device is provided with a hammering structure through a connecting rod, the hammering structure is composed of a large drop hammer, a fixing block and a small drop hammer, the fixing block is connected with the connecting rod through screws, and the large drop hammer and the small drop hammer are arranged at the two ends of the fixing block respectively. A sound collection device electrically connected with the information processor is arranged at the bottom, facing the road surface, of the movable vehicle b