The invention relates to an environment-protecting sound-absorbing fireproof coating for tunnels, belonging to the technical field of fireproof coatings, comprising the raw materials with the following weight proportion: 30 to 50 percent of fire cement, 15 to 30 percent of perlite, 15 to 25 percent of vermiculite, 10 to 30 percent of calcium carbonate or talcum powder and 2 to 5 percent of cellulosic polymeric modifier, wherein, the cellulosic polymeric modifier is preferably hydroxyl ethyl cellulose; the perlite and vermiculite choose two types with the grain diameter being respectively 3mm and 1mm, and the matching proportion of the two types is 7:3; the two types are evenly mixed and then the raw materials are measured and put in a multifunctional mixer for stirring and scattering evenly; the product coating is obtained when qualified. Since cellulosic polymeric modifier is added in the formula and the perlite and vermiculite are carried out rough and fine matching, when the coating is coated on the concrete surface, rough and fine porous surfaces can be formed, endowing the coating with the functions of sound absorbing and vibration resistance based on environment protecting and fire proofing.