The improved mixing extruding machine is made up of mixer and unconventional double-cone screw extruder, which has both the excellent mixing capabilities and the continuous extruding characters. Its extruding part is an unconventional double-cone screw extruder, which are integrated double merits about double cone screw and single screw with strong feeding ability, stable extrusion pressure, supplementary mixing and more excellent quality of products. The pair of rotors and screws can be stepless speed regulating, which ensures match between the feeding capacity of the internal mixer and the extrusion output as well as the perfect mixing property. The mathematical model of the continuous mixing extruding can provide guidance for the actual production. The limitation of the batch-type production is overcome, and fulfilling the manufacture from the raw materials of polyblends to finished product in one machine.