The utility model discloses a high-efficiency slitting device which is characterized by comprising a bearing groove (1), a slitting knife (2) and a handle (3) connected with the slitting knife (2), wherein the slitting knife (2) and the bearing groove (1) are connected by an adjustable moving device (5), the slitting knife (2) contains four groups of blades (4), cutting grooves (6) corresponding to the four groups of blades (4) up and down are arranged on the bearing groove (1), and the inside of the bearing groove (1) is arranged into a semi-cylindrical hollow groove. By utilizing the device disclosed by the utility model, semi-finished products only need to be placed in the bearing groove, and the operation can be finished by pressing down the handle. The operation is simple and quick, the consistency of the products is good, the production efficiency is high, and the manufacturing cost of the device is low.