The invention discloses a wood fire retardant anticorrosive processing method including five steps of wood preprocessing, preparation of a flame retardant preservative, preparation of a flame retardant preservative solution, impregnation and post-drying processing. The fire retardant preservative is prepared from propylene glycol, bronopol, 4, 5-dichloro-N-octyl-4-isothiazolin-3-one, 2-chloro-5-hydroxy meta-xylene, dithiocyano methane, dodecyl dimethyl benzyl ammonium chloride, N-(2-benzimidazole)-methyl carbamate, diammonium phosphate, zinc borate, ammonium molybdate and fatty alcohol polyoxyethylene ether compound. The beneficial effect is that the wood fire retardant anticorrosive processing method is simple in process, practical, efficient, environmentally-friendly, and easy to control, and the like, the processed wood maintains the original features, meanwhile has excellent flame retardant, anti smoke, anti-corrosion, anti mildew, pest control, antibacterial, anti erosion and other muti-function modification effect, is stable in performance, non-toxic, and environmentally-friendly, and can be widely used in indoor and outdoor decoration, building material, furniture material and other fields.