The work aims to collect and summarize the latest research results on the preparation and modification of soy protein isolate (SPI) film at home and abroad to provide basis for the preparation of high-performance series of materials in the future. The basic properties of SPI films and the three main preparation methods of SPI films were summarized by sorting out the literature at home and abroad. The current research situation of SPI modified films was introduced from four aspects, including mechanical properties, moisture-proof properties, bacteriostasis, oxygen and humidity resistance. Finally, the potential application directions of SPI films were summarized. SPI had many advantages, such as wide source, low price, environmental friendliness, etc. After modification, the film-forming properties, mechanical properties, moisture-proof properties, bacteriostasis, oxygen and humidity resistance of SPI films were significantly improved. After effective modification, SPI film has broad and good development prospects in the fields of fresh-keeping packaging, environmental protection packaging, edible packaging, flavor food packaging, etc.