Self-reinforced blend (SRB) of PP homopolymer and Poly(propylene-co-ethylene) copolymer (= PP elastomer) were prepared with 15 different ratios ranging from 100:​0 to 0:​100. PVDF and PP elastomer non-self-reinforced blend (n-SRB) with the same ratios were prepared to examine the self-reinforcement effects. Unlike n-SRB, SEM images revealed that the Polypropylene SRB showed perfect interface with no evident phase boundaries between two components. Further DSC characterization confirmed that PP homopolymer and PP elastomer exist as separate phases. Tensile test on SRB and n-SRB taught us that although PP homopolymer has inferior young’s modulus, tensile toughness, and ultimate strength than PVDF, all the properties got better in SRB than n-SRB. Superiority of SRB over n-SRB was especially prominent in co-continuous phase. Good interface let SRB took advantage of PP elastomer component, allowing the blend to have strain-hardening behavior. The strain-hardening effect contributed SRB to have better strength and tensile toughness compared to n-SRB.