A structure, a decoding method and a decoding device of a barcode are disclosed. One data code of the barcode of the present invention has 8-bit information quantity. Therefore, based on the same print length of the Code 128 barcode, the information density of the barcode of the present invention can be increased and the encoding and the following operation of the barcode can be simplified. In addition, the barcode of the present invention can be configured on a plane of an object, around a plane of a disc, or around a circular side of a cylinder, enabling the decoding device of the present invention to identify the data code, indicating 8-bit information of the barcode, scanned through a corresponding linear motion, disc rotation, or cylinder rotation.
