Every technological and energy revolution in history was accompanied by the emergence of disruptive technologies. Therefore, it is of great significance to study disruptive technologies for the future development of various fields. This paper analyzes the development directions and trends of railway, hydraulic and architectural engineering, and points out that the development direction of railway engineering is intelligent and higher-speed development; the development direction of hydraulic engineering is conforming to nature and human-nature integration; and the development direction of architectural engineering is to be precise, professional, mechanized, informationized, assembled, and eco-friendly. On this basis, this paper summarizes the disruptive technologies in these three fields. The disruptive technologies in the railway field include intelligent high-speed railway, low vacuum pipeline maglev railway; the disruptive technologies in the hydraulic field include the construction technology of basins with rich natural functions, and the multi-objective joint dispatching technology of water resources and hydropower projects; and the possible disruptive technologies in the architecture field include BIM-based intelligent building technology, industrial building technology, 3D printing technology, and green building technology. Finally, this paper puts forward some suggestions to provide reference for the research and development of railway, hydraulic, and architectural engineering.