Polyolefine core tube and method for preparing same

The invention discloses a polyolefin core pipe and a preparation method thereof. The core pipe is obtained by mixing two kinds of high isotacticity of propylene homopolymers according to the weight proportion of 1 to 45 : 99 to 55 and adding maleic anhydride grafted polypropylene and flow processing aids for mixing evenly and through two-steps extrusion, cooling, extension, molding and cutting. The invention adopts the two kinds of high isotacticity of propylene resin with different molecular weights and the flow processing aids to promote the polymer macromolecule chain nucleation and the chain migration and diffusive capacity, speeds up polypropylene crystallization process and improves the processability and the mechanical property of polyolefin; the maleic anhydride grafted polypropylene and a filling reinforcing system intensify the physical and chemical action between fillers and polypropylene resin and between polypropylene resin to strengthen the hardness, rigidity and durability of polypropylene tubu