Fireproof alarming device

The utility model relates to a fire prevention warning device arranged in equipment under railbound vehicles, which has the effect of detecting the fire conditions inside the equipment under the railbound vehicles and giving an alarm. The fire prevention warning device comprises a temperature probe, a warning device, a colliquable tube and a pressure detecting and warning device, wherein, the temperature probe is arranged in the equipment under the railbound vehicles, and is connected with the outside warning device; the colliquable tube is also arranged in the equipment under the railbound vehicles, and is connected with the outside pressure detecting and warning device; and the inner side of the colliquable tube is provided with pressurized gas. When the railbound vehicles are on fire, the temperature probe and the colliquable tube of the fire prevention warning device simultaneously send out warning signals to warn drivers and passengers of taking corresponding safety measures for avoiding serious accidents which are dangerous to the passengers.