An organic modification method on inorganic solid alkali surface is as below: dispersing an inorganic solid alkali in a solvent in a reaction vessel, adding with stirring acrylate / acrylamide, heating with stirring the mixture in the reaction vessel under normal pressure, cooling to room temperature, filtering the mixture in the reaction vessel, washing with a solvent and drying to obtain an inorganic solid alkali with surface organic modification. The invention employs ester or amide with alpha, beta-unsaturated structure as the modifier, the modifier is subjected to an addition reaction with hydroxyl on the inorganic solid alkali surface and bonded to the solid alkali surface, and an organic layer is formed on the surface; the organic layer can convert strongly hydrophilic inorganic solid alkali surface into lipophilic surface and promote the diffusion of reactants with low polarity to diffuse to the catalyst surface in a solid alkali catalytic reaction, thereby improving the reaction efficiency.