Indirect evaporative cooling unit

The utility model discloses an indirect evaporative cooling unit which comprises a control device, an indoor side fixing device, an outdoor side fixing device, a natural cooling mechanism and a compression refrigeration mechanism, the natural cooling mechanism and the compression refrigeration mechanism are respectively and electrically connected with the control device, and the natural cooling mechanism comprises an outdoor heat exchange coil pipe and an indoor heat exchange coil pipe which are connected end to end. The compression refrigeration mechanism comprises a condenser and an evaporator which are connected end to end; the evaporator and the indoor heat exchange coil pipe are arranged in the indoor side fixing device, and the condenser and the outdoor heat exchange coil pipe are arranged in the outdoor side fixing device. According to the indirect evaporative cooling unit, the mode of combining natural cooling and compression refrigeration cooling is adopted, when the temperature of the external envir