The invention discloses a decoration woodworking bench saw provided with a dust collecting device. The decoration woodworking bench saw comprises the dust collecting device and a bench saw body; a movable rod is installed above the bench saw body; an upper guide rod is installed at one end of the movable rod; a lower guide rod is installed at the other end of the movable rod; and the lower guide rod is provided with precise scale marks. In the decoration woodworking bench saw disclosed by the invention, the dust collecting device is installed at one side of a bench saw blade; broken wood bits generated by processing are sucked into the dust colleting device by virtue of a suction force generated by a fan arranged inside the dust collecting device; subsequently the broken wood bits are adhered together and fall on a filter screen frame by virtue of spraying of a spraying head; the spraying of the spraying head can prevent outward overflowing, caused by reflowing of air flow, of the broken wood bits; one movable rod is installed above the bench saw by using two guide rods and two guide rails; and the movable rod can be randomly fixed to any positions on the guide rails according to use requirements, namely according to the length of incision and section of wood processing.