Book loss detector

The utility model provides a book loss detector, and relates to the technical field of environmental protection. The book loss detection machine comprises a book inlet, the output end of the book inlet is a weighing part for keeping a gap, the output end of the weighing part is an attached telescopic supporting part, a conveyor is arranged below the weighing part, the conveyor is fixed in a device shell, the two sides of the center of the conveyor are provided with shooting parts which are fixedly connected, and the shooting parts are arranged on the two sides of the center of the conveyor. The output end of the conveyor is a horizontal scanning placement part with a gap, a fixedly connected ultrasonic scanner is arranged above the scanning placement part, the output end of the scanning placement part is a book outlet, and four symmetrical and fixedly mounted wheels are arranged at the bottom of the device shell; a fixedly connected pushing handle is arranged on the book inlet side of the device shell, a book