Anti-freezing device for thermal instrument

The utility model discloses an anti-freezing device for a thermal instrument, which belongs to the technical field of anti-freezing devices and comprises a protective box, the protective box, a protective door plate and a heat-insulating interlayer can perform first-layer protection on the thermal instrument, and if the first-layer protection cannot meet heat-insulating and anti-freezing effects under extremely cold conditions, the thermal instrument can be protected by the protective door plate and the heat-insulating interlayer. The temperature inside the protection box is still low, the temperature monitor can monitor the temperature inside the protection box in real time, when the temperature inside the protection box is low to the zero point, the single chip microcomputer controls the heating pipe fitting and the exhaust fan to be started, the heating pipe fitting can heat the interior of the protection box, and the anti-freezing effect is improved; the exhaust fan can enable air in the protection box to