The utility model provides a temperature alarm switch is applicable to alarm device, temperature alarm switch includes: temperature -sensing component, shell and setting are in launch part, permanent magnet subassembly and inductance coils in the shell, the temperature -sensing component set up in the open end of shell, the one end of permanent magnet subassembly is passed the opening of open end with temperature -sensing component block is connected, the one end of launching the part support to lean on in the inboard of open end, the other end with the permanent magnet subassembly is connected, inductance coils fixes on the shell, and two of inductance coils wiring ends respectively with alarm device connects, deformation takes place for the temperature -sensing component along with the temperature risees, the permanent magnet subassembly with the temperature -sensing component breaks away from to insert under launching the effect of part inductance coils. The utility model discloses a temperature alarm switch need not extra power and can be used for the temperature to report to the police.