The invention discloses a method for carrying out oleophylic and hydrophobic modification on the surface of a water-soluble inorganic oxidant or inorganic salt, and belongs to the fields of materials, chemistry and chemical technology. The method comprises the following steps: firstly, adding methanol and propylene glycol into a deionized water solution of aluminium chloride, heating the obtained mixture until a reflux is formed, and after methanol is separated, carrying out vacuum drying on the obtained object so as to obtain an intermediate product; then, after oleic acid, n-butyl alcohol, n-hexylic acid and titanous sulfate are mixed to react, adding the intermediate product obtained in the step 1), and the water-soluble inorganic oxidant or inorganic salt into the obtained mixture to continue to react, after the reaction is completed, cooling the obtained object to room temperature, standing and separating the obtained object so as to obtain a solid phase, and then, drying the solid phase so as to obtain a modified water-soluble inorganic oxidant or inorganic salt. The method is adopted for carrying out oleophylic and hydrophobic modification on the surface of the water-soluble inorganic oxidant or inorganic salt, so that the storage stability of the water-soluble inorganic oxidant or inorganic salt in moist air and the particle dispersity of the water-soluble inorganic oxidant or inorganic salt in solutions are improved, therefore, the universality of the water-soluble inorganic oxidant or inorganic salt in industrialized applications can be further improved.