In recent years, the policy upgrading from “plastic restriction order” to “plastic prohibition order”, especially the white pollution caused by plastic packaging, has become a focus of public attention. Polypropylene can be recycled, it is one of the most cost-effective environment-friendly resins at present. In particular,special polypropylene for thermoforming is widely used in microwave appliances, food packaging and other fields. With the development of thermoforming technology, the application of polypropylene thermoforming technology in household refrigerator lining, automobile parts, chemical containers and other large products is also increasing. This article analyzes and introduces the patent applications of polypropylene in the field of thermoforming technology in the past 50 years. The patents are searched,screened and sorted in the worldwide patent database from the technical direction, applicant regional distribution, patent application trends,main patent applicants, core patents and technology evolution routes. It summarizes the technical means used by technicians in recent decades for the application improvement of polypropylene materials in thermoforming technology. It also explores evolution routes of 5 kinds of patented technologies, such as the polymerization of raw materials, filling modification after polymerization, etc. In a word, this article summarizes the application development process of polypropylene materials in the field of thermoforming and may provide reference value and research direction for technicians in this field.