The invention discloses an organic phenol-nanosilicon dioxide system and a preparation method and application thereof. The preparation method comprises the following steps: according to the weight proportion, mixing silicon source and organic phenol in a four-opening bottle and stirring, and dripping mixed liquor of a basic catalyst and water through a constant pressure funnel, namely obtaining the organic phenol-nanosilicon dioxide system. Compared with traditional solvents, such as methyl alcohol, ethanol, and isopropanol, because the organic phenol can take part in the reaction sequentially later, the complicated solvent separation process and the separation purification recycling process of the micromolecule phenol are not needed, and the experiment technological process is simplified. The reactivity of the organic phenol can be improved in the generative process of the nanosilicon dioxide, the synthesized temperature of the phenolic resin is reduced, the reaction time is shortened, the reaction efficiency is improved, and the production cost is greatly reduced.