The work aims to explore the effects of 3-aminopropyl triethoxysilane (APTES) modified microcrystalline cellulose (MCC) on starch composite film to improve the property of starch film through silanized microcrystalline cellulose (MMCC). Firstly, the starch was gelatinized at 90 ℃ before MCC or MMCC is added. Then, the starch composite film was prepared by solution casting. The scanning electron microscope (SEM), thermogravimetric analysis (TGA) and other test methods were used to analyze the morphology and thermal properties of the composite films. The contact angle meter, universal material tensile machine and other instruments were used to analyze mechanical property, hydrolytic resistance and moisture absorption performance of the films. The results showed that for the starch film prepared by blending MMCC (the ratio of MCC to APTES was 5∶1) to starch (MMCC-2/ST):the tensile strength of MMCC-2/ST was 230% higher than that of the native starch film (ST), and the water contact angle of MMCC-2/ST was 106.4 °, 60.8° higher than that of the ST. Experiments show that, MMCC can improve the mechanical property and hydrolytic resistance of starch film, therefore broaden the application of starch film in the field of packaging.