Differentiated polypropylene fiber has the characteristics of environmental protection, non-toxic, acid and alkali resistance, low specific gravity, small thermal shrinkage rate, low thermal conductivity, less static accumulation, environmentally friendly, lightweight, etc. It is widely used in safety net belts, industrial lifting belts, flexible container bags, geotechnical fabrics, industrial filter cloths, ropes and cables, optical cables, high-pressure fire hoses, conveyor belts, industrial sewing threads, tent canvas, polypropylene anti-cracking fibers, plastic woven bags and other fields. It is a new ideal synthetic fiber material that can replace polyester, nylon, and ethylene fiber.