The utility model discloses a temperature-measuring screw bolt which comprises a screw cap and a screw stud, wherein the screw stud extends out of the bottom of the screw cap. The temperature-measuring screw bolt further comprises a temperature-measuring element, wherein a counter bore is formed at the top of the screw cap, one end of the temperature-measuring element is fixed in the counter bore, and the temperature-measuring element is a wired temperature sensor or a wireless temperature sensor. When the temperature-measuring screw bolt is mounted on a conductive copper bar at joints at two ends of a circuit breaker, and the temperature of the conductive copper bar rises, the temperature sensor converts a detected temperature signal to an electrical signal and further conducts or transmits the electrical signal into a power distribution cabinet or an external temperature-measuring module, and if the detected temperature value exceeds the set safe temperature, the temperature-measuring module emits a signal for audible and visual alarm, thereby facilitating the timely overhaul of the copper bar of overhaul staff and ensure the normal running of a whole power system. The utility model has the advantages of simple structure, convenient maintenance, disassembly and assembly, low cost, and high detection precision.