The invention discloses a coding device used for multi-copy note collating and coding equipment. The coding device comprises a first coding machine 3.1, a second coding machine 3.2 and a control system 5, the first coding machine 3.1 and the second coding machine 3.2 are completely identical in structure, and the control system 5 controls the first coding machine 3.1 and the second coding machine 3.2 to complete coding of notes in a cooperation mode. The design scheme that the second coding machine 3.2 with the same structure as the first coding machine 3.1 is additionally arranged behind the first coding machine 3.1 is adopted in the coding device, the second coding machine 3.2 is used for coding the notes which are not coded by the first coding machine 3.1, and therefore efficient coding of notes of various widths can be achieved.