The invention discloses room-temperature type power insulator anti-fouling flashover paint, a preparation method thereof and a power insulator. The paint comprises a hard paint and a room-temperature curing agent, wherein the hard paint comprises the following components: resin with hydrophobic migrating performance, silicone acrylic resin, a solvent and a leveling agent; and the room-temperature curing agent comprises the following components: a catalyst and ethyl orthosilicate. Compared with the prior art, the paint has excellent hardness, a self-cleaning property, hydrophobicity and curing performance.