The utility model provides a temperature indicator structure of low voltage apparatus, includes the casing and arranges the binding post of casing both sides in, the top of casing is equipped with the line ball screw hole, and the low voltage apparatus is in one side of setting up line ball screw hole front for the casing, and the front of casing is equipped with the temperature indicating layer of discolouing that is used for instructing the binding post temperature variation, when binding post's temperature rise exceeded the alarm threshold value who sets for, the temperature indicating layer of discolouing became another kind of colour by a colour and warns. The utility model discloses temperature indicator structure of low voltage apparatus sets up the temperature indicating layer of discolouing in the front of casing, is convenient for carry out in situ observation to binding post's temperature rise, the temperature indicating layer setting of changing colour is positive at the casing, and the temperature indicating layer that prevents to change colour takes place the interference with other components when the installation, put forward high -low voltage electric appliances's safe practicality, solve the not hard up too big binding post's of arousing of contact resistance who arouses of binding screw the too high problem of temperature rise.