The invention relates to an intumescent fireproof paint for a tunnel. The intumescent fireproof paint is prepared from the following raw materials in percentage by weight: 10-30% of refractory cement, 10-30% of AEC expansive cement, 5-10% of a polyacrylate emulsifier solution, 8-15% of a polyvinyl acetate emulsion, 5-10% of a silicone acrylic emulsion, 5-10% of melamino-formaldehyde resin, 3-7% of disperse latex powder, 1-3% of aluminium hydroxide powder, 1-3% of perlite powder, 1-4% of flyash, 1-3% of melamine fiber, 1-3% of polyphenylene sulfide, 1-3% of polyether-ether-ketone, 1-3% of ammonium polyphosphate, 1-2% of fatty alcohol polyoxyethylene ether, 3-8% of kaolin, 3-10% of nano TiO2 and 3-8% of nano SiO2. According to the intumescent fireproof paint, a drying coating is relatively thin and excellent in bonding strength and fire resistance.