The invention discloses a rolling cutter which comprises a driving motor, an active gear mounted on an output shaft of the driving motor, a first transmission gear engaged with the active gear, a first cutting disc fixed and coaxially mounted with the first transmission gear, a second transmission gear engaged with the first transmission gear, and a second cutting disc fixed and coaxially mounted with the second transmission gear. A cutting opening is formed between the first cutting disc and the second cutting disc. The second transmission gear and the second cutting disc are mounted on a movable cutter shaft, the movable cutter shaft can be arranged on a fixed seat in an axial moving mode, and an adjusting spring and a compressing nut are arranged between the movable cutter shaft and the fixed seat. The distance between the first cutting disc and the second cutting disc is adjusted by adjusting the telescopic length of the movable cutter shaft to adapt to sheets with different thicknesses, cutter clamping is avoided while cutting precision is guaranteed, the security is guaranteed, the flatness of the sheets cut by the rolling device is high, the precision of subsequent rolling can be improved, the entire structure is stable, and construction is facilitated.