TECHNOLOGY FOCUS - CHEMICAL ENGINEERING - Preferred Components: The drying primary-extrusion compact unit A comprises a motor (2), a driving wheel (1), a feed port (6), a drying primary-extrusion compact cavity (6), a variable pitch auger (8), a transition storage chamber (7) and an adjustable electric heater (9); the variable pitch auger (8) is contained in the primary-extrusion compact cavity (6); the driving wheel (1) is at one end of the variable pitch auger (8); the motor (2) is connected with the driving wheel (1) via belt; the feed port (3) is above the drying primary-extrusion compact cavity (6) while the transition storage chamber (7) is under the drying primary-extrusion compact cavity (6); the adjustable electric heater (9) is located on shell of the drying primary-extrusion compact cavity (6) and the transition storage chamber (7). The heating extrusion forming unit B comprises a motor (5), a driving wheel (4), a heating extrusion forming cavity (11), a variable pitch auger (12), a connecting flange (13) and an adjustable electric heater (10); the variable pitch auger (12) is contained in the heating extrusion forming cavity (11); the driving wheel (4) is at one end of the variable pitch auger (12); the motor (5) is connected with the driving wheel (4) via belt; upper surface of the heating extrusion forming cavity (11) is connected with the transition storage chamber (7) and the other end is connected with a cooling treating shape preserving cavity (16) via the connecting flange (13); the adjustable electric heater (10) is on shell of the heating extrusion forming cavity (11). The cooling treating shape preserving unit C comprises a connecting flange (13), a cooling treating shape preserving cavity (16), a cooling water circulating chamber (18), a cooling water inlet (17) and a cooling water outlet (15); the cooling treating shape preserving cavity (16) is connected with the heating extrusion forming cavity (11) via connecting flange (13); the cooling water circulating chamber (18) is set outside the cooling treating shape preserving cavity (16) and it is provided with the cooling water inlet (17) and the cooling water outlet (15). The automatic slicing unit D comprises cutter (19) and operation mechanism (20); the cutter (19) set with the operation mechanism (20) is at one end of outlet of the cooling treating shape preserving cavity (16). The operation control unit (14) comprises an operation control case and corresponding linking and controlling components configured along with the operation control case; the front end of mandrel of the variable pitch auger (12) is set with a core bar (21) having certain diameter and length. The inner diameter of the cooling treating shape preserving cavity (16) is greater than that of the heating extrusion forming cavity (11).