The dry powder fire extinguisher can put out general fires, as well as fires caused by oil and gas combustion. The dry powder fire extinguisher uses carbon dioxide gas or nitrogen gas as the power to spray out the dry powder in the cylinder. Dry powder is a kind of dry, easily flowing fine solid powder, which is composed of fire-extinguishing base material, moisture-proof agent, flow accelerator, caking prevention agent and other additives. It is mainly used to put out the initial fire of flammable liquid, flammable gas and electrical equipment such as oil and organic solvent.