There are many types of fire extinguishers, which can be divided into portable and trolley types; according to the power source of driving the extinguishing agent can be divided into storage cylinder type, storage pressure type, chemical reaction type; according to the filled extinguishing agent can be divided into foam, dry powder, halogenated alkane, carbon dioxide, water, etc. We have already briefly introduced dry powder fire extinguishers, foam fire extinguishers, and carbon dioxide fire extinguishers, and we will not dwell too much on these three in this article, mainly focusing on water fire extinguishers, simple fire extinguishers, and aerosol fire extinguishers, a brief introduction to these three types of fire extinguishers.