Screw rod with flow channel section capable of being designed in parameterization mode

The invention discloses a screw rod with a flow channel section capable of being designed in a parameterized mode. The screw rod comprises a screw rod body, a screw edge and a flow dividing and mixing element. Parametric design is conducted on part of or all the flow channel sections in the spiral groove direction, specifically, the spiral groove depth is decreased while the spiral groove width is increased, and the spiral groove depth is increased while the spiral groove width is decreased, so that mass transfer exists in each flow channel section in the spiral groove width direction, and mass transfer also exists in the spiral groove depth direction; part or all of the flow channel gradually converges along the direction of the spiral groove according to a linear change rule, so that the material is continuously compacted while being sheared and stretched; the flow dividing and mixing element comprises a plurality of flow choking blocks arranged on the circumferential face of the rear section of the screw r