A temperature measuring device includes a local terminal and a measuring element installed at a predetermined distance from the local terminal. The local terminal includes a first measuring unit for measuring a first human body temperature, a signal processing unit for receiving and converting the first human body temperature, a display unit coupled to the signal processing unit for displaying the converted first human body temperature, and a first interface unit coupled to the signal processing unit. The measuring element includes a second interface unit and a second measuring unit coupled to the second interface unit for measuring a second human body temperature and transmitting the second human body temperature via the second interface unit to the first interface unit, which sends the second human body temperature to the signal processing unit, which converts the second human body temperature and transmits the converted second human body temperature to the display unit, which displays the converted second human body temperature.