The utility model relates to a linear cutting device of light material, including the frame, frame bottom both sides are equipped with the leading wheel, and frame top one side is equipped with the action wheel, and the opposite side is equipped with the take -up pulley, and the action wheel is driven by driving motor, and the take -up pulley is established on taut adjustment mechanism, and the scroll saw closed hoop is around on leading wheel, action wheel and take -up pulley. Compare that unnecessary material is got rid of in traditional manual work or engraving cutter gets rid of unnecessary material from level to level, invent and to realize quick large tracts of land and get rid of unnecessary light material to can the quick replacement machining tool through the instrument quick change, practice thrift the manual work and get rid of material cost or save engraving cutter and process the required plenty of time layer upon layer.