Based on multi-source heterogeneous data including power data, economic data, and energy data, taking Tianjin as the research object, the comparative advantages of Tianjin's industries, correctly evaluates the development level of Tianjin's industrial structure are analyzed, and Tianjin's industrial upgrading potential is discussed. The results show that in the past 10 years, the dominant comparative advantage of the tertiary industry in Tianjin was obviously higher than that of the secondary industry and the primary industry. Tianjin has a stronger advantage in developing the tertiary industry than the primary industry and the secondary industry. The potential of Tianjin's industrial structure upgrading is showing a good trend. In the future, Tianjin can regard the tertiary industry as the focus of economic development, and the secondary industry as the focus of the city's industrial upgrading.