The invention provides a polypropylene composition for preparing a tensile thin film and the tensile thin film prepared from the same. The polypropylene composition comprises (A) 100 parts of propylene polymer composition and (B) 0.01-1 part of nucleating agent, wherein the component (A) comprises propylene random copolymer and propylene homopolymer, has the overall tacticity index of 95-97 percent, the ethylene content of 0.3-0.5 percent by weight, and the melt flow rate of 2-4 grams/10 minutes; and the mass ratio of the propylene random copolymer to the propylene homopolymer is (30:70)-(70:30). The obtained polypropylene composition has superior high-temperature tensile property, high rigidity, lower haze and higher glossiness, and particularly shows strong competitiveness when used for preparing a thinned BOPP (Biaxially Oriented Polypropylene Laminated Polyethylene) film.