The work aims to propose an emergency equipment design method for highway tunnel fire accidents, so as to reduce the casualties and property losses caused by highway tunnel fire accidents, and improve the synergy and handling capacity of emergency rescue. An integrated design process incorporating Fault Tree Analysis (FTA), Analytic Hierarchy Process (AHP), and Theory of Inventive Problem Solving (TRIZ) was established to guide the design of emergency equipment for highway tunnel fires. Highway tunnel fire accidents over the years were compiled and analyzed to establish a fault tree model. AHP was applied to construct an analytic hierarchy model, calculate the weights of risk indicators at each level, and then rank them. Subsequently the TRIZ theory was applied to define problems and conduct contradiction analysis, leading to the formation of conceptual design schemes and extension of functionality. Lastly, the design practice was conducted for emergency equipment for highway tunnel fires and the usability of the design scheme was verified. Through the FTA-AHP-TRIZ design process, it objectively and scientifically determines each basic event and its weighted ordering, ensures that the functional transformation has logic and systematic, and provides new ideas for design of emergency equipment.