Abstract: Device for splitting and cutting firewood, having a clamping device (3) adapted to be secured to an abutment plate (2) which is displaceable by hydraulic force. A log can be inserted through the clamping device between a guide plate (6) and two angled knives (5), and by activating a hydraulic cylinder (8) it will be forced between the two knives in the clamping device and a fixed vertical knife (1). A horizontal knife (4) may be arranged on the side of the vertical knife such that splitting and cutting are achieved simultaneously. The clamping device (3) is easily removed to use the device only as a splitter whereby the firewood is forced between the abutment plate (2) and the fixed knife (1), whereas the horizontal knives (4) simultaneously split more of the firewood.