Co2-exiting is a machine set up in the fire department for self-service replenishment and maintenance of fire extinguishers. It uses carbon capture, storage and reuse technology to collect carbon dioxide in the city and make it into fire extinguishing materials through the machine; Also integrates the app to remind users of the maintenance and filling time, provide fire knowledge education, reduce the injury caused by improper maintenance and expiration of fire extinguishers, and provide a complete set of fire extinguisher maintenance, filling and recycling process for the public.