A safe outdoor electrical equipment cabinet comprises a bottom plate, heating devices, a cabinet body, an air extractor, drying devices and an adsorption device, wherein first positioning blocks, first springs, first vertical rods and first oblique rods are arranged on the bottom plate; each heating device comprises a first cross rod, a first vertical plate, a second oblique rod, a heat dissipation frame and a heating rod, and first through holes, first filter nets, second positioning blocks, holding rings, second cross rods and second through holes are formed in the cabinet body; the air extractor comprises a pipeline, a fan, a valve, a first support rod and a third oblique rod; each drying device comprises a baffle, a third cross rod, second springs, a first sponge block, a second filter net, a third filter net and a fourth filter net; the adsorption device comprises sloping panels, second vertical plates, fourth cross rods, a second sponge block, third springs and a third sponge block. Air entering the safe outdoor electrical equipment cabinet is sufficiently dried, and damage to inside components and parts is prevented.