Fire detection tube type fire extinguishing device

The utility model discloses a fire detection tube type fire extinguishing device. The fire detection tube type fire extinguishing device comprises a shell, an agent cavity, a gas cavity and a first piston cavity are formed in the shell, a gas flow channel is arranged between the gas cavity and the agent cavity in a communicating mode, the gas flow channel is communicated with the first piston cavity, the first piston cavity is communicated with a fire detection tube, and sealing gas with preset air pressure is arranged in the first piston cavity and the fire detection tube. A first piston is slidably arranged in the first piston cavity in an airtight mode, and under the action of sealing gas, the first piston can be inserted into the gas flow channel in a sealed mode and cut off the gas flow channel. The first piston is inserted into the gas flow channel in a sealed mode, the gas flow channel is cut off, and the gas cavity and the medicament cavity are separated, so that power gas can be well isolated and sto