The key technologies of fire detection and fire extinguishing equipment, such as fire detection equipment, fire control equipment cabinet and so on, have been developed To solve the problem of contamination, the high sensitivity photoelectric detection technology and non-destructive suppression technology are integrated to realize the non-destructive fire protection for key small spaces such as data center cabinets. The system is specially designed for the standard cabinet with the size of 1U, which can realize the installation without affecting the normal operation of the cabinet. The fire extinguishing agent is a new type of environmental protection and non-corrosive agent. The liquid fire extinguishing agent is rapidly atomized and completely covered by the whole space by using high-pressure propulsion jet technology, so that the cabinet fire can be contained in the primary stage. The system can be used for both military and civil use. It is mainly used in the server, network cabinet, telecommunication cabinet and other equipment in the data center. It can continuously monitor and effectively extinguish the initial fire caused by short circuit, overload, overheating, line aging and other events inside the cabinet. It has great social and economic significance to protect the safe operation of important core parts in China.