A juicer including a juicing device and a driving device adapted for driving a juicing device, the juicing device includes a container and a roller being rotatably mounted inside the container, the roller is adapted to be driven by the driving device, the roller includes first and second cutting plates being projected outwardly from an outer surface of the roller, a juice outlet and a residue outlet are positioned on a container wall, a plurality of cutting plate receivers is arranged on the outer surface of the roller and is adapted for allowing the first and second cutting plates to be slidingly mounted inside the cutting plate receivers, the first cutting plate includes at least one cutting member having a convex structure mounted on a surface of the first cutting plate.
