The air-water separator is a device that is matched with an unpowered refrigeration unit and can effectively remove liquid water mist from compressed air. It is a pre-treatment device for high-efficiency compressed air filters. Removing moisture from compressed air is the primary task of compressed air purification treatment. Impurities carried by water in compressed air can corrode pipelines, valves, instruments, and equipment, increasing production costs. The air-water separator is not only an ideal component for screw compressors, but also an essential water removal device for the post-treatment of general air compressors.