“The integration of information era and industrialization”, and “digital transformation”, digitalization and intelligence have become the development direction of the natural gas purification industry. As one of the important infrastructures for the development of intelligence applications for natural gas purification plants, the next-generation intranet should have the characteristics of simple structure, high bandwidth, easy to upgrade, low cost, ability to carry multiple services, ability to expand, long life, and user friendly in terms of operation and maintenance. However, the natural gas purification plant intranet still uses traditional copper cables as the data transmission medium. The complex network structure, high overall cost, and insufficient network bandwidth constrain the development of the entire industry, especially in large-scale and long-distance application scenarios where the bottleneck in network transmission performance is particularly prominent. Under the general trend of “optical advances and copper retreats”, the adoption of full-optical networks in the new generation of intranet will show major advantages. By analyzing the characteristics, advantages, and feasibility of application of passive optical network in voice, video and data services of intelligent purification plant, we believe that the passive optical network enjoys more advantages in deployment, operation and maintenance, expansion, etc., and is suitable for the development of intelligent purification plants. The study presented in this paper can also provide references for solving the existing issues.