Closed heat insulation air cooler

The invention relates to a closed heat insulation air cooler which comprises an upper heat exchange chamber and a lower heat insulation chamber, wherein finned tube heat exchangers and spraying nozzles are mounted in the upper heat exchange chamber; the finned tube heat exchangers are arranged in a V-shaped manner; the lower heat insulation chamber comprises three corrugated fiber moistening boards which are arranged in an encircling manner to form a cavity; the cavity takes the shape of an inverted triangle, so as to form air intake surfaces, used for enlarging the air intake filtering surfaces and improving adiabatic humidifying and cooling effects, on two sides of a V-shaped structure. The air inlet of the air cooler is V-shaped, so as to enlarge the air intake area and improve the supply air rate of the air cooler, and further improve the integral heat exchange effect of the air cooler. The closed heat insulation air cooler comprises four working modes, namely a spraying evaporation cooling mode, an adiabatic humidifying evaporation cooling mode, a dry cooling mode and a natural cooling mode, which are controlled automatically through an electric control device, so that the air cooler can be in an optimal economical operation mode all the while, and electrical energy and water resources are saved.