The PVC twin-screw extruder granulator is a high-speed twin-screw extruder with forced conveying, high-efficiency plasticizing and mixing and shearing dispersion. The back pressure of the inorganic head is refluxed to avoid high shear and overheating. The lower-stage extruder is a large-diameter single-screw extruder operating at low speed, with independent temperature control, low-speed operating with low shear force, internal cooling of the screw to avoid decomposition of plasticized materials, and single-screw extrusion to ensure the establishment of pressure and stable extrusion Out.