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The work presented herein focuses on developing the Al2O3 based organic/inorganic multifunctional composite films via an internal addition method in the presence of dripping agent, antifogging agent, light stabilizer and insulation barrier agent. The resulting composite films were systematically characterized using scanning electron microscope, FTIR, differential scanning calorimetry, UV, and tensile testing machine. The morphology changed obviously after introducing the inorganic fillers. In addition, the results indicated that the contact angle of the activated Al2O3–10 film had the best stability and the film with ultrafine Al2O3 possessed the best anti‐dripping performance. The time of the first water drop of the film containing 10 g activated Al2O3 (the activated Al2O3–10) was 7 min and 18 s, and the time of each ten‐drops was less than 120 s. The simulated anti‐aging period of the films with anti‐aging agent was up to 423 days, which is superior to many other reported organic/inorganic composite films and can be applied to those extreme climate areas (such as Xinjiang, China). [ABSTRACT FROM AUTHOR]