Fire suppression device

The utility model discloses a fire suppression device which comprises an inhibitor bottle, an injection mechanism and a constant pressure mechanism. The constant-pressure mechanism comprises a gas cylinder, a piston assembly, a driving assembly and a pressure reduction assembly. When fire suppression is carried out, the driving assembly is started and drives the piston head to move in the pressurizing cavity in a reciprocating mode. In the process, the gas continuously enters the rodless cavity from the rod cavity and then enters the high-pressure cavity from the rodless cavity, so that the air pressure in the high-pressure cavity is increased. Furthermore, after the pressure of the gas in the high-pressure cavity is reduced to the preset pressure through the pressure reduction assembly, the gas can be input into the inhibitor bottle, so that the gas pressure in the inhibitor bottle is increased, the inhibitor can be sprayed out of the nozzle under the pressure effect, and fire suppression is achieved. Moreov