The invention discloses a fire extinguishing agent filling device and a filling method thereof. A dry powder fire extinguisher filling machine discloses a fire extinguishing agent filling device and a filling method thereof, the equipment includes vacuum pump, storage container 1, Filling Assembly 1, Storage Container 2, Filling Assembly 2, Storage Container 3, Filling Assembly 3, storage container 4 and Filling Assembly 4. The fire extinguishing agent filling device is used for first vacuumizing the fire extinguisher with a vacuum pump, and then filling the fire extinguisher with at least one solvent stored in the storage container 2 through the Filling Assembly 2, and filling helium stored in storage container 3 in a three-way fire extinguisher filled with a filling assembly, and then filling at least one fire extinguishing agent stored in storage container 1 in a fire extinguisher filled with a filling assembly, the backward fire extinguisher fills nitrogen gas stored in storage container three. The filling machine of dry powder extinguisher is easy to vacuum and leak-chck, and it can improve the inner air pressure of Extinguisher, reduce the error of filling pressure of extinguishant caused by pipeline
effctively, so as to improve the filling efficiency and meet the filling requirements of various demands.