The utility model provides a W type cigarette filter rod making device. Forming device includes silk bundle collection device and silk bundle forming device, and the silk bundle that transversely sets up there being the cross -section to be isosceles trapezoid in silk bundle forming device becomes the die cavity, establish the silk bundle that the tangible form is the same and collect the chamber in silk bundle collection device, and docks with silk bundle one -tenth die cavity in silk bundle collection chamber, installing two through last briquetting roller pivot and going up the shaping pinch roller in bottom surface top or below that the silk bundle becomes the die cavity broad, become the narrower bottom surface below of die cavity or top at the silk bundle and install a lower shaping pinch roller through briquetting roller pivot down, cavity pattern that the outward flange of three shaping pinch roller and the outer fringe of silk bundle one -tenth die cavity formation W appeared is equipped with bearing and bearing cap respectively at the both ends of upper and lower briquetting roller pivot, steam input hole has been seted up on silk bundle forming device. The utility model discloses whole simple structure, the shaping is convenient quick, and the mouth stick that is prepared from is different with current mouth rod -shaped, can richen the face shaping of filter rod.