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In order to obtain the temperature field data of the spray bar in the icing wind tunnel in real time, temperature sensor needs to be used to collect the temperature signal. The traditional thermal resistance temperature sensor needs to connect a large number of long-distance cables, which takes up a large amount of internal space of the spray bar. For improving the quality and efficiency of temperature field measurement, the measurement technology of spray bar temperature field in icing wind tunnel based on distributed optical fiber temperature measurement is studied. Firstly, the general situation of measuring temperature field of spray bar is analyzed, and the distributed optical fiber temperature measurement method is studied. Secondly, U type optical fiber wiring method is designed, and the temperature measuring system of spray bar in icing wind tunnel based on distributed optical fiber temperature measurement is established. Finally, the global temperature measurement of 20 layers of spray bars is realized, and the temperature field distribution of spray bar is analyzed in detail. The practical application shows that the spray bar temperature field measurement system can provide temperature feedback for the spray bar electric heating system, and improves the measurement efficiency of the temperature field greatly.