The invention relates to a modified vitrified hollow micro-pearl insulation fireproof mortar, which consists of the mixed components with the following weight portions of 450-500 portions of ordinary Portland cement, 450-500 portions of vitrified micro-pearl, 13.5-15.5 portions of emulsion powder, 3.5-4.0 portions of polypropylene staple, 3.5-3.8 portions of hydroxypropyl methylcellulose, 3.5-4.0portions of water-soluble titanate coupling agent and 10 portions of calcium formate. The product of the invention overcomes the phenomenon of expanded perlite of large water absorption, easy pulverization, large volume shrinkage in slurry stirring, laser easy made low strength, hollow bulge, split, etc. At the same time, the product of the invention makes up for the defects of polystyrene particle organic materials of inflammable performance, poor fireproof performance, generated harmful gas at high temperature, low anti-aging and weatherability performances, large anti-elasticity in the construction, bitten easiness by insects, etc. the product of the invention has the advantages of good insulation performance, good cohesiveness and bleeding resistance, perfect anti-aging performance, high performance-price ratio, twenty five years of weatherability, A grade of fireproof combustion resistance, bulge-free, split-free, high compressive strength, etc.