The invention discloses a desert air filer device, and relates to an air filter device which is applicable to a generator set in a desert, belonging to the field of electromechanical devices. The device is in the form of a container, wherein a filter device, a generator and a fan are sequentially arranged in the container; the generator is connected with the air outlet of the filter device through a pipeline; and the fan is located on the rear wall of a container body. The desert air filter device is characterized in that a pre-filter device is arranged at the container opening of the container and the pre-filter device consists of a roller shutter door, a groove-type baffle plate, a dust collection box and a rain shield; and the filter device consists of cyclone dust collectors, a support and the air outlet. The device is applicable to air pre-filtering in a high-concentration, low-flow rate and large-particle sand dust environment; most sand dust in the air can be effectively filtered; and the desert air filter device is especially applicable to the generator set in the desert, and the service life of the generator set can be well prolonged.