The invention relates to a dustproof switch cabinet. The dustproof switch cabinet comprises a cabinet body, wherein an installing groove is formed in the bottom of the cabinet body; a dustproof device is installed inside the installing groove; the dustproof device sequentially comprises a filter screen, outer dustproof gauze, a fan and inner dustproof gauze from the outside to the inside; the filter screen is used for filtering relatively large impurities and dust; the outer dustproof gauze and the inner dustproof gauzes are used for filtering relatively small impurities and dust; small part of the dust and the impurities can be stopped from entering the fan to the maximum extent so as to effectively prevent the dust and the impurities from entering the switch cabinet, thereby effectively protecting the switch cabinet and prolonging the service life of the switch cabinet.