The invention discloses a temperature alarming device. The temperature alarming device comprises a liquid thermometer (10), a power supply, and a plurality of alarming elements electrically connected with the power supply; an insulated heat conducting medium is placed in the liquid thermometer; a plurality of pairs of conducting terminals (11), which extend from the interior of the liquid thermometer to the exterior of the liquid thermometer, are arranged at the parts, with different temperature scales, of the liquid thermometer; the plurality of pairs of conducting terminals are respectively electrically connected with the plurality of alarming elements so as to form different circuits; a conductive connecting sheet (12) which can move along the heat conducting medium is also arranged in the liquid thermometer; and the conductive terminals in one of the plurality of pairs of conductive terminals can be interconnected by the connecting sheet (12) so as to form a channel together with the alarming elements. By adopting the temperature alarming device, an operator does not need to measure the acidic solution per se in the whole process of heating and measuring, so that the operator can be prevented from being injured during the process of implementing a corrosive test.