The utility model discloses a temperature monitoring apparatus, comprising a temperature range judging module which is connected with an external control equipment, and at least two temperature checking modules. Wherein, each temperature checking module is used to check the temperature and deliver a temperature signal to the temperature range judging module. The temperature range judging module judges the temperature to see if the temperature is over the standard according to the received temperature signal. A temperature monitoring signal which controls the action of the external control equipment is output according to the result of the judgment. The utility model reduces the possibility of sending out false instruction, and improves the reliability of environmental monitoring. When the temperature checking module is broken, a temperature checking fault alarm signal is sent out by the utility model. Thus, the working state of the temperature monitoring apparatus is convenient to be known.