The invention discloses a high-efficiency forage cutting device with the quality of raw materials not easy to destroy. The device includes a machine frame, the bottom of the machine frame is provided with a base, the side of the base is provided with a supporting column, a top plate is installed on the bottom of the supporting column, the middle portion of the left side of the supporting column is provided with a first fixing plate, the rear side of the first fixing plate is provided with a drive motor, the front end of the drive motor is provided with a first rotating shaft, and the first rotating shaft passes through the drive motor and is provided with a transmission disk and a drive wheel; the right end of the upper plane of the base is provided with a second fixing plate, a second rotating shaft penetrates through the second fixing plate, a first bevel wheel and a driven wheel are installed on the second rotating shaft, and the drive wheel is connected with the driven wheel through a belt. The device has the advantages that the materials are regularly cut, damage to plant cells of the raw materials is reduced, rotting of forage is avoided, and the loss of the nutritional value is reduced.