A stump extraction device that includes two opposite jaws, two opposite cutting blades that are extensions of free ends of the jaws, a rotation device, and fixing elements that are configured to rigidly fix the stump extraction device to a desired object. The rotation device is configured to rotate the body and the jaws with respect to the fixing elements. A moving working machine includes the stump extraction device and a knuckle boom assembly, to an end of which the stump extraction device is rigidly connected. The moving working machine may be a crawler excavator. In a method, roots in the ground are cut off from a stump by closing of the jaws, and the stump is separated from the roots by lifting the stump extraction device by means of the knuckle boom assembly.
