The invention provides propylene polymer composition used for making biaxially oriented film, said composition contains propylene random copolymer and propylene homopolymer, said random polymer is copolymer of propylene and ethylene, and optionally has one or more alpha-olefin selected from C4-C10 olefins, said propylene polymer composition has total tacticity measured by nuclear magnetic resonance which is greater than or equal to 96.5%, content of ethylene in the polymer composition is greater than 0.3wt%, and wherein the propylene random copolymer has melt flow rate which is lower than that of the propylene homopolymer. Biaxially oriented polypropylene film made using propylene polymer composition of this invention exhibits excellent physical property, has high modulus and stiffness in the case of not adding any stiffness strengthening agents, and film-forming stability during making oriented polypropylene film is very good, and orienting film-forming speed is high.