The invention relates to a multi-screw and multi-screw disc combined mixing extrusion molding device. The device comprises an extrusion head, first to fourth radial bearing packs, an electric heating ring, a special-shaped cylinder, a hopper, a base, a first driving mechanism, a second driving mechanism, a first motor, a second motor, a first transitional gear, a second transitional gear, first to fourth gears, and first to fourth thrust bearings. The multi-screw and multi-screw disc combined mixing extrusion molding device is characterized by further comprising a center screw and first to third rotary discs. A center screw channel unit is arranged at the left end of the center screw. A first end face screw channel unit, a second end face screw channel unit and a third end face screw channel unit are arranged on the left end faces of the first rotary disc, the second rotary disc and the third rotary disc respectively. An outer circumference screw channel unit is arranged on the outer circumference of the left end of the third rotary disc. The center screw channel unit, the first to third end face screw channel units and the outer circumference screw channel unit are sleeved with the special-shaped cylinder and are communicated in sequence, so that a material smashing, grinding, extruding, mixing and conveying channel is formed. The multi-screw and multi-screw disc combined mixing extrusion molding device has the beneficial effects of having the high smashing, plasticizing, mixing and grinding capacities, remarkably improving the material smashing, plasticizing, mixing and extruding quality, and the like.