The high toughness and heat resistant of binary PLA/PBS based degradable composites were prepared by blending modification of PLA and PBS with maleic anhydride (MAH), glass fiber (GF), plasticizer (ZRJ-121) and other additives. The effects of different modification systems and glass fiber content on the toughening and heat resistance of PLA/PBS alloy were investigated. The results show that the modified PLA/PBS composites have high toughness, and the elongation at break and impact strength of C1 sample can reach 40.36% and 4.4 kJ/m2, respectively. MAH modified composite has higher crystallinity, tensile strength and elastic modulus. And with the increase of glass fiber content, tensile strength has no significant change, and elastic modulus gradually increased, elongation at break and impact strength gradually decreased. The Vi-cat softening point of the modified PLA/PBS composite is close to 120 ℃, and the initial degradation temperature can reach 247.38 ℃, showing excellent heat resistance. In conclusion, MAH modified PLA/PBS composite has excellent toughening and heat resistance properties, which can be used in the preparation of fully degraded glasses frames and broaden its application range.