The work aims to study the effect of polypropylene raw materials on the mechanical and processing properties of non-woven fabrics, so as to prepare non-woven fabrics with high mechanical properties and good spinning properties. Polypropylene powder with different melt indexes was used as the base resin and mixed with different peroxides for melt extrusion granulation. The basic physical properties, molecular structure, odor, VOC, residue and mechanical properties and processing stability of the samples were characterized and analyzed by gas chromatography, high temperature gel permeation chromatography, tensile test, etc. No. 4 resin raw material sample prepared by extrusion granulation with a small amount of 3,6,9-trimethyl-1,4,7-triperoxynonane in the powder with a melt index of 8 g/10 min (GB/T 3682.1-2018) had high melt fluidity (MFR of 35-40 g/10 min), narrow molecular weight distribution (3-5), low ash content and fish eye count, low odor, and low residual peroxides, resulting in non-woven fabric products with high tensile strength, high spinning efficiency and stable processing. The molecular weight design of basic polypropylene resin, the formulation system of raw materials, and the process route all have a significant effect on the mechanical properties and spinnability of non-woven fabric products.