In recent years, with the rapid development of the flexible displays and wearable electronic devices, higher requirements have been placed on the performance of electronic devices, such as lightweight and flexible. Polymer films such as transparent polyimide (CPI) and polyethylene terephthalate (PET) have gained widespread attention in the field of flexibleoptoelectronic materials owing to their high transparency, light weight, good bendability and high mechanical strength. However, due to the characteristics of their molecular structure, polymer films generally have the problems of low surface hardness and poor abrasion resistance. Therefore, enhancing the surface hardness and abrasion resistance of polymer films without compromising theircharacteristics such as transparency, light weight and flexibility become an urgent problem to be solved. Among the various enhancement strategies that have been developed, applying optically transparent coatings with abrasion and bending resistance to the surface of polymer films is one of the most effective and promising approaches. Hard flexible coatings are mainly achieved by organic–inorganic hybridization to achieve both hardness and flexibility. Organic polysilazanes can retain their organic groups while forming the Si—O—Si network structure by hydrolysis condensation reaction, which can realize organic-inorganic hybridization and providing a basis for constructing hard flexible coatings. In this work, an organic–inorganic hybrid hard flexible coating was prepared at 80 ℃ 90%RH by hybridizing organic polysilazane OPZ181 with triethoxysilane (KH550). The effect of KH550 content on the conversion process of OPZ181 was investigated, and the structure and properties of the hard flexible coatings were systematically characterized.