The invention belongs to the technical field of temperature measurement and particularly relates to a Roots pump working temperature measuring method. A temperature sensor applied to the method comprises a sleeve, a thermocouple, a lead, a vibrating cylinder, a vibration damping module, a fixing plate, telescopic rods, a spring, a corrugated pipe, a damping module and a fixing cylinder, wherein the vibration damping module is arranged between the sleeve and an inner wall of the vibrating cylinder and is used for supporting the sleeve and realizing vibration damping of the sleeve, the lead between the corrugated pipe and the fixing plate is sleeved by the spring, one end of the corrugated pipe and an end surface of the vibrating cylinder are connected through hinging a set of telescopic rods, the damping module is arranged between the corrugated pipe and the fixing cylinder, and the damping module is used for supporting the corrugated pipe and making the moving corrugated pipe subjectedto certain damping. The method is advantaged in that side impact is absorbed through the telescopic rods, impact transmitted by the vibrating cylinder is absorbed through the damping module, the temperature is tested by the thermocouple under the condition having no impact and no vibration, and accuracy of the test result is improved.