AbstractA novel process of film preparation using a self‐made internal mandrel and external mold reverse rotation die is proposed. In this process, the mold's inner mandrel and outer parts rotate in opposite directions to achieve melt circumferential shear flow. In the blowing‐film process, a polymer melt is subjected to a flow field composed of extruded pressure extrusion and the reverse rotation of the die. The equipment has been used to successfully prepare low‐density polyethylene films. The microstructure and properties of films obtained under various internal and external reverse rotation speeds were studied. The results show that the rotation speeds are beneficial for forming a highly ordered crystalline structure of the film. As a result of microstructure evolution, the transverse direction (TD) tensile strength was enhanced by 39.4% and the machine direction (MD) tensile strength was enhanced by 47.4%. TD and MD breaking elongation increased by 38% and 43%, and the TD tensile breaking stress from 7.41 MPa was enhanced up to 10.79 MPa and the MD tensile breaking stress from 7.24 MPa was enhanced up to 11.26 MPa. The TD and MD tear strength increased by 38.2% and 28.3%. This novel blowing‐film process can be used to control the microstructure of films by controlling process parameters to improve the mechanical properties of films. © 2022 Society of Industrial Chemistry.