The digital economy is the key force driving the sustainable development of the digital industry, and the development and growth of the digital industry cannot be separated from the policy support and innovation drive, and only through the establishment of a scientific and reasonable policy system, can we better utilize the important role of the digital industry. Based on 54 policy documents issued by national and local governments about the sustainable development of China’s digital industry from 2017 to 2023, this paper adopts the policy informatics theory, content analysis method, rooted theory, and NVivo 12.0 software to analyze and quantify the content of the policy texts related to the digital industry. The study found that the text of the digital industry policy continues the internal logic of “goal - foundation - drive - means - guarantee”. The results show that the sustainable development of China’s digital industry should be based on digital infrastructure, the accumulation of data elements as the driving force, the development of digital industrialization, the digital transformation of industries, the digitization of public services, and the international cooperation of the digital economy, and through the digital economy governance system and security system as the guarantee of the sustainable development of the digital industry.