The invention relates to a cement-base composite material for grouting treatment of water-rich fractured rocks and a preparation process of the cement-base composite material. The cement-base composite material for grouting treatment of water-rich fractured rocks comprises, by mass, 69-77 parts of portland cement clinker, 23-31 parts of mineralizer and 0.34-1.55 parts of additive powder retarder. The mineralizer comprises, by mass, 75-79 parts of ground quartz, 6.8-7.6 parts of calcium chloride, 2.8-3.6 parts of lithium chloride, 1.9-2.4 parts of talcum powder, 2.0-2.5 parts of hydroxypropyl methyl cellulose, 2.1-2.6 parts of wollastonite powder, 0.6-0.9 part of titanium dioxide, 3.1-3.8 parts of sodium hexametaphosphate and 1.5-2.1 parts of super plasticizer. Since portland cement clinker and mineralizer are processed by the combined grinding technology, and specific surface area of the material is controlled to be larger than 500m2/kg and residue on sieves of 80 micrometers in a vacuum sieving process is controlled to be less than 8% respectively by the Blaine method and the vacuum sieving analysis method, uniform performance of the material is achieved. Condensation time of the material is controllable, the strength of the material is high in early stage and later period, volume expansion of the material is slight, retention of the material is over 91% on a condition of 30m/min flowing water, and accordingly, the material can be applied to grouting reinforcement treatment engineering of water-rich fractured rocks widely.