The invention relates to a novel composite underwater anti-dispersion high-strength acrylate grouting material which comprises a material A, a material B and a material C. The material A is composed of a calcium magnesium acrylate solution, deionized water, a surfactant, a calcium magnesium ion chelating agent, a cross-linking agent and an accelerant. The material B is prepared from an initiator and deionized water; the material C is prepared from superfine cement, a flocculating agent, steel slag microspheres, an active excitant and low-temperature expandable microspheres. According to the underwater anti-dispersion high-strength acrylate grouting material, the calcium-magnesium ion chelating agent is used as a retarder, so that the grouting material is green, environment-friendly, non-toxic and harmless; superfine cement is matched with a flocculating agent, so that the compressive strength and the water dispersion resistance are greatly improved, and meanwhile, heat is provided forexpansion of the low-temperature expandable microspheres; the low-temperature expandable microspheres are adopted, so that the slurry has excellent elasticity and tensile property while maintaining high compressive strength after hardening, and the elongation rate can reach 205%; and the steel slag microspheres are adopted, so that the viscosity of the slurry is sharply reduced to 8Pa. S, and thegrouting performance is excellent.