▎ 摘　　要

NOVELTY - The utility model claims a temperature pre-warning device applied to machine room, comprising: graphene-based sensitive material coating, hollow substrate, signal amplifier, safety resistor, a comparator, an alarm. the graphene-based sensitive material coating is paved on the first plane of the hollow substrate, and is signal amplifier with the safety resistor and placed in the hollow substrate, the connecting wire is respectively connected with the safety resistor in the hollow substrate signal amplifier the preset small hole on the side surface of the first plane, one end of the comparator is connected with the safety resistor in the signal amplifier substrate through the small hole, the other end of the comparator is connected with the alarm. The utility model has simple structure, reasonable design, only needs the utility model is placed in the machine room and the electric wire is electrified to realize the temperature warning function, without complicated mounting step and the complex sensor arrangement, can be widely applied to the temperature warning technology field.