Liquefied petroleum gas (LPG) plays a very important role in the global clean energy consumption market. It is transported by vessel between ports, and the ports have formed a series of extremely close-knit trading communities through local dense trade relations. In this study, we build transportation networks based on the global LPG vessel trajectories data from 2013 to 2017, and adopt a community detection method to analyze the characteristics of this type of trading community and evolution trend. The results show that: (1) The ports in the LPG trading community are more closely connected, and the hub ports in different communities are becoming closer over time. (2) The number of ports in each trading community shows an increasing trend, and the ports in the same community are becoming more geographically agglomerated. (3) Communities formed in the Asia-Pacific region, the Middle East, North and West Europe and the Mediterranean region have maintained an important position in the global LPG trade, while those in the Americas have gradually evolved from a relatively isolated community to one that has close ties with other communities over time.