The invention provides a grooving machine for bi-directional paperboard grooving. The grooving machine comprises a workbench (100), a paperboard feeding device (200), a vacuum adsorption assembly (300), a movable cutter assembly (400), a fixed cutter (500), an output belt (600) and a rack (700), wherein the paperboard feeding device (200), the movable cutter assembly (400), the fixed cutter (500) and the output belt (600) are sequentially arranged on the workbench (100) and are used for achieving transportation and cutting grooving of paperboards; the paperboard feeding device (200) is positioned at the foremost end of a production line, and is used for placing and feeding the paperboards; the workbench (100) is positioned at the undermost part of the rack (700); the fixed cutter (500) is directly fixed to the rack (700), and is used for cutting the moving paperboards; and the output belt (600) is positioned at the rearmost end of the production line, and is used for outputting the cut paperboards. According to the grooving machine, the production efficiency of paperboard grooving is improved, the paperboards are located and processed at a time, the defective rate is decreased, raw materials are fully utilized, and the production cost is reduced.