A scanning device includes a scanner, a fixing seat, a sensor, and a processor. The fixing seat is provided with a positioning groove for fixing a position of a workpiece. The sensor senses whether the workpiece is on the fixing base. The processor is communicatively coupled to the scanner and the sensor and used for receiving signals from the sensor and sending instructions to the scanner. If the sensor senses the workpiece on the fixing base, the processor controls the scanner to scan an identification code on the workpiece. If the sensor does not sense the workpiece on the fixing base, the processor controls the scanner to stop scanning.