The invention relates to a polypropylene fiber which is comprised by weight ratio of A: 70-97.5% of polypropylene part, B: 0.5-15% of modified polypylene part, C: 0.1-5% of nucleator part, D: 0.1-20% of black carbon and nanometer SiO2 part, E: 0-1% of coloring agent part except black carbon. Said polypropylene fiber can be mixed with increased fiber such as glassfiber so as to make various yarns mixed with fiber, blanket, cloth, textile, knitting, then preform or directly machine composite product. Here, percentage composition of increased fiber such as glassfiber can reach more than 60% (weight ratio). |