A full-width seal device, comprising a paper inlet, a paper outlet and a housing outside, wherein the full-width seal device comprises a component movable in an X-axis direction, a component movable in a Y-axis direction and a sealing mechanism inside, wherein the component movable in the X-axis direction is configured to detect whether a piece of paper has entered the paper inlet and move the piece of paper in the X-axis direction after it is detected that the piece of paper has entered the paper inlet, and the component movable in the Y-axis direction is configured to move the sealing mechanism in the Y-axis direction after the piece of paper has moved to a pre-set position on the X-axis, and the sealing mechanism is configured to execute a task of sealing after the sealing mechanism has moved to a pre-set position on the Y-axis, characterized in that, the component movable in the X-axis direction comprises a paper inlet sensor, a transmission gear set, an upper friction wheel, a lower friction wheel, a second motor and a paper passing channel, wherein the paper inlet sensor is fixed at the paper inlet and is connected to the second motor for detecting whether the piece of paper has entered the paper inlet in real time, and if it is detected that the piece of paper has entered the paper inlet of the device, the second motor is activated, and the second motor is connected to the transmission gear set, and the transmission gear set is fixed to the housing, is located in the X-axis direction and is connected to the upper friction wheel and the lower friction wheel, and the transmission gear set is rotated by the second motor when the second motor is activated, and the upper friction wheel and the lower friction wheel are further rotated as the transmission gear set is rotated, the upper friction wheel moves in an opposite direction to the lower friction wheel for providing a friction driving force to the piece of paper, and the friction driving force allows the piece of paper to move in the X-axis direction, and the paper passing channel connects the paper inlet and the paper outlet, and the piece of paper enters the paper passing channel from the paper inlet, and after the sealing is completed, the piece of paper is moved to the paper outlet through the paper passing channel, wherein the paper passing channel comprises a lower channel plate, a front channel upper plate, a sealing mechanism guide plate and a seal bracket press plate, wherein the lower channel plate is made of a whole piece of sheet metal part and extends to the paper outlet from the paper inlet and is drilled with a plurality of sets of small holes, and the small holes in the lower channel plate are located corresponding to the lower friction wheels respectively, and the lower friction wheels pass the small holes in the lower channel plate to partly pass through the lower channel plate, and the front channel upper plate is drilled with a plurality of sets of small holes with each set having two small holes, and the small holes are located corresponding to the two upper friction wheels adjacent to the paper inlet respectively, and the upper friction wheels pass the small holes in the front channel upper plate to partly pass through the front channel upper plate, and the sealing mechanism guide plate is overlapped on the front channel upper plate, and the seal bracket press plate is overlapped on the sealing mechanism guide plate.