In order to reduce the negative impact of insufficient heat transfer and dead zones in traditional pin structures on the quality of product extrusion molding, in this article, a novel field synergy torsion-pin element was proposed, of which mixing and thermal transport characteristics during the polymer extrusion process were studied. In order to evaluate its mixing and heat transport characteristics, simulation numerical simulations were conducted on four types of screws, including a new type of torsion-pin element. A series of characteristic parameters such as mixing efficiency, distribution index, and temperature distribution were compared and analyzed. The results show that the new field synergy torsion-pin element causes the fluid to flow radially along the torsion surface, enhances the synergistic effect between the velocity field, velocity gradient field, and temperature gradient field, and thus leads to an increase in mixing efficiency and convective heat transfer coefficient, a decrease in distribution index, and an enhancement of mixing heat transfer effect, further optimizes the extrusion molding quality of the product.