The utility model provides a cooling cap, the cap is internal to be provided with waterproof vapour intermediate layer, arrange in the intermediate layer a plurality of both ends respectively with inlayer, the air inlet hose that can lift up the skin when aerifing of venthole is seted up to outer fixed its pipe wall of flexible, interbedded lower part has exhaust hole and wash port, the cap still has water storage bag, water smoke generator and gas blowing device, gas blowing device's outlet duct and air inlet hose intercommunication, and a mouthful outlet duct of connecting gas blowing device takes place for the fog of water smoke generator, be provided with on the pipeline of outlet duct and be used for carrying out refrigerated semiconductor refrigeration subassembly to water smoke. When the person of wearing feels that the head is warm, to inflate to pressing from both sides intraformational air inlet hose through gas blowing device, the intermediate layer is sent into to the water smoke that the water smoke generator produced behind semiconductor refrigeration, after fog got into air inlet hose, crooked air inlet hose was strutted to lift the upper strata, force the intermediate layer volume to expand rapidly, press from both sides intraformational air and water smoke absorption heat (inflation heat absorption principle), play the effect for the cooling of the person's of wearing head.