Fire-extinguishing device capable of preventing mis-start and provided with fire detecting tube

The invention discloses a fire-extinguishing device capable of preventing mis-start and provided with a fire detecting tube, comprising a tank and a valve body, wherein the valve body is internally provided with an air inlet passage and an air outlet passage, and is provided with a piston for disconnecting or connecting the air inlet passage and the air outlet passage, the piston is slidably connected to the valve body, and the valve body is also provided with a start chamber. The valve body is provided with a connector I which communicates with the start chamber. A valve is connected in series between the connector I and the valve body. The valve body is provided with a connector II which communicates with the air outlet passage. The fire detecting tube is connected between the connectorII and the connector I. The valve body is provided with a connector III communicating with the air inlet passage, and an air extraction assembly is connected in series between the connector III and the valve body, and the air