The invention discloses a ceiling cassette smart combined air conditioner, comprising a cassette body; the outer side of the front end of the cassette body is provided with an air outlet section; the cassette body is sequentially arranged and connected with a filter section, a disinfection and sterilization section, a freeze protection section, a surface cooling section, a reheat section, a humidification section, a fan section, a static pressure section and an air supply section according to the air circulation direction. The advantages of the invention: it is provided with integrated functions for detecting, displaying and controlling the indoor air quality, and can realize intelligent control and regulation of indoor air temperature, humidity, freshness, cleanliness, ultraviolet sterilization, negative oxygen ions, odor removal, formaldehyde removal and other multi-functional integration, meeting the most favorable effects of indoor health and comfort.