Eight-color full-rotation letterpress printing device

The utility model discloses an eight-color full-rotation letterpress printing device which comprises a machine frame, letterpress printing machines and a UV box, a supporting structure is arranged inside the bottom end of the machine frame, a limiting structure is arranged on one side of the bottom end of the machine frame, the letterpress printing machines are installed at the top end of the machine frame, and the UV box is installed on one side of each letterpress printing machine. The limiting structure comprises a moving shell, a motor, a limiting plate, a bidirectional lead screw and a moving block, the moving shell is installed at the top end of the rack, and the motor is fixed to the bottom end of the moving shell. The limiting plates are used for limiting the moving range of paper, the motor is started to drive the two-way lead screw to rotate, and the distance between the limiting plates is adjusted, so that the device is suitable for paper with different widths, the paper limiting function of the de