The invention discloses a non-radiation detecting device for road flaw detection. The non-radiation detecting device comprises a tractor, a camera and an ultrasonic detector. The end of the tractor isprovided with a baffle. The lower part of the tractor is connected to a suction cup. A telescopic rod is mounted on the lower portion of the suction cup. A support is connected to the end side of thetelescopic rod. The upper part of the support is provided with a storage device. The camera is mounted at the lower part of the support. The side of the camera is provided with a connection rod. Theend side of the connection rod is provided with a base. An ultrasonic detector is connected to the lower part of the base through threads. The end side of the support is provided with a protective cover. The lower part of the protective cover is provided with rollers. The camera and the ultrasonic detector are respectively electrically connected to the storage device. The camera acquires road surface conditions. The ultrasonic detector detects the inner case of the road. The protective cover and the baffle block the ultrasonic waves so that people damage is avoided.