The invention relates to the technical field of paperboard processing equipment and discloses a paperboard film-laminating device. The paperboard film-laminating device comprises a processing table, wherein a motor and a support frame are arranged on the processing table, the support frame is rotatably connected with an axial pipe, the axial pipe is arranged between the support frame and the processing table, a belt is connected between the axial pipe and the motor, the axial pipe is fixedly connected with an upper gear and an upper rolling cylinder, a through hole is formed in the upper rolling cylinder, a fan is arranged outside the axial pipe, a rotating part is arranged in the fan, one end of the axial pipe is inserted into the fan and is fixedly connected with the rotating part, an air inlet hole is formed in a part, arranged in the fan, of the axial pipe, a part, arranged in the upper rolling cylinder, of the axial pipe is communicated with a conducting sleeve, the conducting sleeve is arranged dead against the through hole, the conductive sleeve is internally slidably connected with a slider bar, a brush head is arranged at one end, far away from the axial pipe, of the slide bar, the processing table under the upper rolling cylinder is rotatably connected with a lower rolling cylinder, the lower rolling cylinder is fixedly connected with a lower gear, and the lower gear is meshed with the upper gear. By virtue of the paperboard film-laminating device, bubbles can be prevented from being produced during paperboard film laminating.