The invention discloses a carbon nanotube/epoxy resin composite reinforced grouting material and a preparation method thereof. The carbon nanotube/epoxy resin composite reinforced grouting material comprises the following raw materials: a base material, a reinforced material and an addition material; wherein the base material comprises sulphoaluminate cement, fly ash, quartz sand and polypropylenefiber; the reinforced material comprises a carbon nanotube, epoxy resin, a dispersant, a diluent and water; and the addition material comprises a superplasticizer, a swelling agent, an antifoaming agent, a curing agent and water. The preparation method comprises the following steps: mixing the dispersing agent and water, stirring, adding the carbon nanotube, stirring, dispersing, adding epoxy resin and the diluent, stirring and dispersing to obtain the reinforced material; mixing sulphoaluminate cement, the fly ash, the quartz sand with the polypropylene fiber to obtain the base material; mixing the superplasticizer, the swelling agent, the antifoaming agent with the water to obtain the addition material; and after mixing the base material with the addition material, adding the reinforcedmaterial and stirring to obtain the grouting material. The obtained grouting material has relatively high compressive strength, flexural strength and fracture toughness, and excellent impermeability.