Double-limit temperature controller of machine cabinet

The utility model discloses a double-limit temperature controller of a machine cabinet, comprising a temperature sensor, a voltage regulator circuit, a comparison circuit, a trigger circuit, a drive circuit and an alarm circuit; the output end of the temperature sensor is connected with the input end of the voltage regulator circuit; the output end of the voltage regulator circuit is connected with the input end of the comparison circuit; the output end of the comparison circuit is connected with the input end of the trigger circuit; the output end of the trigger circuit is connected with the input end of the drive circuit; and the output end of the drive circuit is used for starting the alarm circuit and a machine cabinet fan. With the double-limit temperature controller of the machine cabinet, the temperature in the machine cabinet is kept within a proper range, so that not only can the aim of controlling the temperature be achieved, but also the use of the machine cabinet fan is reduced to certain extent, thus prolonging the service life of the machine cabinet fan and ensuring the safety of the machine cabinet; moreover, time is saved for the workers.