Sticky food is prone to residue on the surface of packaging material, affecting the consumer experience while not conducive to the recycling of materials. This research aimed at preparing super-hydrophobic poly(lactic acid)(PLLA) by the combination of copolylization, blending and hot pressing. The PLLA-PDMS-PLLA (PLDLx) triblock copolymer was synthesized by ring-opening polymerization of lactide (LA) with hydroxy-terminated poly-dimethylsiloxane (PDMS) as initiator. The copolymer was further blended with different contents of nano hydrophobic silica (SiO2) to improve its hydrophobicity.Finally, didderent surface structures were constructed by hot pressing. The structure, composition, molecular weight, mechanical properties, gas barrier property and contact angle of the composite films were characterized. Results show that the composite films keep better flexibility and the maximum elongation at break is increased about 10 times; the water vapor and O2 permeability are decreased slightly. Moreover, the contact angle of the PLDL0.5Sμ-80 blending film reaches 153°, suggesting a super-hydrophobicity. The residual rate of yogurt with 300 mPa·s viscosity decreases to only 9.4%.