Parallel twin screw extruder is a kind of high efficient mixing, smelting, extruding equipment. Its core section is composed of "00" type barrel and two gearing screw, matching with driving system, control system and feeding system to form a kind of special extruding, graining and shaping processing equipment. The screw and barrel adopt building type design principle to change the length and the barrel, choose different screw stem parts to assemble the line according to material characteristics so as to reach the best work condition and max function.