Temperature test for the safe and rapid development of military, metallurgy, chemical industry and other industries is of great significance, especially temperature measurement in high temperature environment, ultrasonic temperature measurement compared with other temperature measurement methods has the advantages of wide temperature measurement range, fast response time, high measurement accuracy; Nowadays, most of the sensors used for ultrasonic temperature testing are mostly straight waveguide rods, in order to cope with some special environments (such as nuclear reaction fuel rods, pipelines and some environments that require smaller sensors, etc.), a special-shaped spiral distributed waveguide sensor is designed, which can stretch, fold or change the size of the sensor according to the size of the environment area, and can also process multiple reflection notches as needed for multi-point measurement in the same environment. Through experiments and COMSOL simulation to fit the temperature curve of WRe25, it is verified that the upper temperature limit of the test temperature can reach 1600°C. The conclusion shows that the test accuracy is high, and the spiral waveguide rod meets the application requirements of high temperature test, and provides a reference for reducing the test environment of the sensor and improving the test accuracy.