Slot-digging device for edge trimmer

The utility model belongs to a wood-working tool, in particular to a flat-edge-trimmer ditch-scrapping device for the woodworker processing the paint-free plate, which comprises the flat-edge-trimmer (1) and a knife tool (4). Wherein, on the flat-edge-trimmer (1), a fixing cylinder (3) is fixed by a handled screw (2) and a handled nut (6). The lower end of the fixing cylinder (3) is made into a semi-circle, the end of which is fixed with a positioning slide plate (5), the middle side of which is made into a semi-circle. The device performs the ditch-scrapping on the paint-free plate, which is labor-saving, time-saving, highly-precise and highly-speeded. In the case of fixing the paint-free plate beforehand to carry on the ditch-scrapping then, the precision and speed will be much higher.