Fresh air control device

The utility model discloses a fresh air control device. A fresh air pipe and an air outlet pipe are arranged in the fresh air system box; the fresh air pipe and the air outlet pipe are arranged in a crossed mode. The same first heat exchanger is arranged at the crossed position of the first heat exchanger and the second heat exchanger; the two ends of the fresh air pipe and the two ends of the airoutlet pipe are located indoors and outdoors correspondingly. A filter is arranged at the end, located outdoors, of the fresh air pipe, an air dehumidifier, an air humidifier and a humidity detectorare sequentially arranged on the section, located inside the fresh air system box and close to the outdoors, of the fresh air pipe, and a temperature detector and a second heat exchanger are arrangedon the surface of the section, close to the indoors, of the fresh air pipe. By means of the second heat exchanger, air in the fresh air pipe can be heated or refrigerated, so that the temperature of the air entering a room from