The invention provides a cleaning device for concrete detection. The device comprises a cleaning box, a conveying device, a sweeping device, an air spraying device, a dust collecting device, a guide plate and a collecting box. Supporting legs are arranged at a bottom of the cleaning box, bottoms of the supporting legs are horizontally arranged, two ends of the cleaning box are opened, supporting blocks are arranged on two sides of a bottom plate of the cleaning box respectively, the conveying device comprises two conveying rollers, a power motor and a conveying belt, and two ends of the conveying rollers are arranged on the side walls of the supporting blocks on the two sides respectively. According to the invention, a to-be-cleaned concrete block is cleaned in an omnibearing manner, therefore, a large amount of dust carried by the surface of the concrete block is removed, the cleanness of the concrete block is ensured, the normal operation of the concrete block detection is facilitated, the accuracy of a detection result is ensured, the dust is prevented from polluting an environment, the dust is prevented from polluting a working environment, and the cleanness of the environmentis ensured.