The utility model discloses a cutting device for foamed plastic, frame floor surfaces is located to the support column of this device, the support column top surface is located to the slide rail, theslider is located the slide rail, the slider top surface is located and the middle part is equipped with the grooving to the cutting push pedal, cutting push pedal bottom surface is located and be located the grooving below to the dump bin, dump bin and dust catcher are connected to transmission pipe both ends, the dust catcher locate cutting push pedal top through the strut and the suction inletjust to the grooving, cutting arm locates the rack top plate other end perpendicularly, the cutting arm bottom is located and be located the grooving to the cutting molybdenum filament, cutting push pedal top surface is located to the baffle and competent spout is opened on upper portion, the upper and lower terminal surface of lug is located and be located horizontal spout to the pulley, the lugside is connected to support arm one end, electric putter is connected to the other end, electric putter's output shaft is connected to the pneumatic cylinder, the hydraulic stem bottom of pneumatic cylinder is located to the clamp plate. This device possesses foamed plastic and compresses tightly the function with waste recycling, ensures cutting accuracy, stops the potential safety hazard, improves life.