The present invention relates to a large-capacity explosion-proof air conditioning system for extreme cold, and more particularly, to an air conditioning system formed with a large capacity but equipped with an explosion-proof facility in the outdoor air supply device used in ships or plants operating in cold weather. The present invention is provided with an outside air inlet and an outside air outlet, the housing is formed in a multi-layered structure to have an explosion-proof performance; A louver installed on the outside air inlet side of the housing; A preheater installed on the outside air inlet side of the housing and formed of a core structure formed in a radial or airfoil shape installed on the inside of the housing relative to the louver; A damper installed on the outside air outlet side of the housing and automatically adjusted to control the flow rate; And an intake fan installed inside the housing and installed between the preheater and the damper. The intake fan is. Cylindrical case made of a material that does not generate sparks with open both sides; An impeller made of a material that does not generate sparks that are installed to be rotated inside the case; And a control panel panel installed on the side of the case and provided with a circuit for controlling the rotation of the impeller, and having a closed structure and formed in a multi-layer structure, and a flow rate control capable of automatically adjusting between the preheater and the louver The technical gist is that a circulation line through which the valve is communicated is further provided.
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