Abstract: The device is mounted on a support plate (3) by means of vice (1) formed by gripping jaws (23). The rotating grinding wheel (6) driven by its motor is carried by an arm swivelling on a pivot (5) and may be displaced longitudinally, as well as vertically and may be displaced angularly in both directions with respect to the chain (4) to be sharpened. The sharpening of the chain's teeth (7) is effected by the grinding wheel (6) after locking the chain with the vice (1). In this manner the teeth of the chain may be sharpened without removing the chain from the saw.