Disclosed is a preparation process of a fire and corrosion prevention wooden door. The preparation process comprises the following steps that (1) a fire and corrosion prevention coating is prepared, wherein the raw materials comprise 15-30 parts of water-based resin, 10-16 parts of polydimethyl siloxane, 0.4-1.2 parts of mica powder, 2-4 parts of organic silicone modified styrene-acrylic emulsion,4-8 parts of a dispersant, 10-14 parts of a flame retardant, 3-6 parts of a bactericide, 4-6 parts of a film-forming assistant, 1-3 parts of a pH regulator and 2-4 parts of a stabilizer, the water-based resin, the flame retardant and the bactericide are put into a reaction kettle to be mixed evenly, then the dispersant, the mica powder and the organic silicone modified styrene-acrylic emulsion are added into the reaction kettle to be mixed, after mixing, the film-forming assistant, the pH regulator and the stabilizer are added, stirring continues to be carried out to disperse the materials evenly, and thus the fire and corrosion prevention coating is obtained; and (2) after the two sides of a door plate of the wooden door are polished smoothly, the fire and corrosion prevention coating issmeared, after air-drying of the coating, finish paint is smeared, and after air-drying of the finish paint, a layer of the fire and corrosion prevention coating is smeared.