The invention discloses a preparation method of an acid/alkali-resistant corrosion-resistant aluminum pigment. The method comprises the following steps: in an alcohol system, coating and modifying an aluminum pigment by using a long-chain silane coupling agent and silicate used as precursors under synergic actions, washing and drying to obtain the high-acid/alkali-resistance high-corrosion-resistance Al/SiO2 composite pigment. The corrosion-resistant aluminum pigment has the advantages of high glossiness, high acid/alkali resistance, favorable dispersity in the water-based system and simple technique.